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== | In [[mathematics]] and [[physics]], the '''Christoffel symbols''', named for [[Elwin Bruno Christoffel]] <ref name="christoffel" >{{citation|title=Ueber die Transformation der homogenen Differentialausdrücke zweiten Grades|last=Christoffel|first=E.B.|author-link=Elwin Bruno Christoffel|journal=Jour. für die reine und angewandte Mathematik|volume=B. 70|pages=46–70|year=1869|url=http://gdz.sub.uni-goettingen.de/dms/load/img/?PPN=GDZPPN002153882&IDDOC=266356}}</ref> (1829–1900), are numerical arrays of real numbers that describe, in coordinates, the effects of [[parallel transport]] in curved [[surface]]s and, more generally, [[manifold]]s. As such, they are coordinate-space expressions for the [[Levi-Civita connection]] derived from the [[metric tensor]]. In a broader sense, the [[Covariant derivative#Coordinate description|connection coefficients]] of an arbitrary (not necessarily metric) [[affine connection]] in a coordinate basis are also called Christoffel symbols.<ref>See, for instance, {{harv|Spivak|1999}} and {{harv|Choquet-Bruhat|DeWitt-Morette|1977}}</ref> The Christoffel symbols may be used for performing practical calculations in [[differential geometry]]. For example, the [[Riemann curvature tensor]] can be expressed entirely in terms of the Christoffel symbols and their first [[partial derivative]]s. | ||
At each point of the underlying ''n''-dimensional manifold, for any local coordinate system, the Christoffel symbol is an [[Matrix (mathematics)|array]] with three dimensions: ''n'' × ''n'' × ''n''. Each of the ''n''<sup>3</sup> components is a [[real number]]. | |||
Under ''linear'' [[coordinate transformations]] on the manifold, it behaves like a [[tensor]], but under general coordinate transformations, it does not. In many practical problems, most components of the Christoffel symbols are equal to [[0 (number)|zero]], provided the coordinate system and the metric tensor possess some common symmetries. | |||
In [[general relativity]], the Christoffel symbol plays the role of the '''gravitational force field''' with the corresponding ''gravitational potential'' being the ''metric tensor''. | |||
== | ==Preliminaries== | ||
The definitions given below are valid for both [[Riemannian manifold]]s and [[pseudo-Riemannian manifold]]s, such as those of [[general relativity]], with careful distinction being made between upper and lower indices ([[covariance and contravariance of vectors|contra-variant and co-variant]] indices). The formulas hold for either [[sign convention]], unless otherwise noted. | |||
[[Einstein notation|Einstein summation convention]] is used in this article. The connection coefficients of the [[Levi-Civita connection]] (or pseudo-Riemannian connection) expressed in a coordinate basis are called the '''Christoffel symbols'''. | |||
==Definition== | |||
If ''x''<sup>''i''</sup>, ''i'' = 1,2,...,''n'', is a [[local coordinate system]] on a manifold ''M'' with [[metric tensor]] <math>g\,</math>, then the [[tangent space|tangent vectors]] | |||
:<math>\mathrm{e}_i = \frac{\partial}{\partial x^i}=\partial_i , \quad i=1,2,\dots,n</math> | |||
define a local coordinate [[basis of a vector space|basis]] of the tangent space to ''M'' at each point of its domain. | |||
== | ===Christoffel symbols of the first kind=== | ||
The Christoffel symbols of the first kind can be derived either from the Christoffel symbols of the second kind and the metric,<ref name="ludvigsen">{{citation |last1=Ludvigsen |first1=Malcolm||title=General Relativity: A Geometrical Approach | year=1999|page=88}}</ref> | |||
:<math>\Gamma_{cab} = g_{cd} \Gamma^{d}{}_{ab}\,,</math> | |||
or from the metric alone,<ref name="ludvigsen">{{citation |last1=Ludvigsen |first1=Malcolm | title=General Relativity: A Geometrical Approach | year = 1999|page=88}}</ref> | |||
:<math>\Gamma_{cab} | |||
=\frac12 \left(\frac{\partial g_{ca}}{\partial x^b} + \frac{\partial g_{cb}}{\partial x^a} - \frac{\partial g_{ab}}{\partial x^c} \right) | |||
= \frac12\, (g_{ca, b} + g_{cb, a} - g_{ab, c}) | |||
= \frac12\, \left(\partial_{b}g_{ca} + \partial_{a}g_{cb} - \partial_{c}g_{ab}\right) \,. | |||
</math> | |||
As an alternative notation one also finds<ref name="christoffel" >{{citation|title=Ueber die Transformation der homogenen Differentialausdrücke zweiten Grades|last=Christoffel|first=E.B.|author-link=Elwin Bruno Christoffel|journal=Jour. für die reine und angewandte Mathematik|volume=B. 70|pages=46–70|year=1869|url=http://gdz.sub.uni-goettingen.de/dms/load/img/?PPN=GDZPPN002153882&IDDOC=266356}}</ref><ref name="chatterjee">{{cite book | |||
|first1=U. |last1=Chatterjee | |||
|first2=N. |last2=Chatterjee | |||
|year=2010 | |||
|title=Vector & Tensor Analysis | |||
|page=480}}</ref><ref name="dirkstruik">{{cite book | |||
|first1=D.J. |last1=Struik | |||
|title=Lectures on Classical Differential Geometry | |||
|edition=first published in 1988 Dover | |||
|year=1961 | |||
|page=114}}</ref> | |||
</ | |||
== | :<math>\Gamma_{cab} = [ab, c].</math> | ||
It is worth noting that <math>[ab, c] = [ba, c]</math>.<ref name="bishopgoldberg" >{{citation | last1=Bishop|first1=R.L.|last2=Goldberg|first2=| title = Tensor Analysis on Manifolds| year=1968|page=241}}</ref> | |||
===Christoffel symbols of the second kind (symmetric definition)=== | |||
The Christoffel symbols of the second kind are the connection coefficients —in a coordinate basis— of the [[Levi-Civita connection]], and since this connection has zero torsion, then in this basis the connection coefficients are symmetric,i.e., <math>\Gamma^k{}_{ij}=\Gamma^k{}_{ji}\,</math>.<ref name="chatterjee">{{cite book | |||
|first1=U. |last1=Chatterjee | |||
|first2=N. |last2= Chatterjee | |||
|title=Vector & Tensor Analysis | |||
|year=2010 | |||
|page=480}}</ref> For this reason a torsion-free connection is often called 'symmetric'. | |||
</ | |||
== | In other words, the Christoffel symbols of the second kind <ref name="wolfram2ndkind" /><ref name="chatterjee">{{cite book | ||
|first1=U. |last1=Chatterjee | |||
|first2=N. |last2=Chatterjee | |||
|title=Vector & Tensor Analysis | |||
|year=2010 | |||
|page=480}}</ref> | |||
<math>\Gamma^k{}_{ij}</math> (sometimes <math>\Gamma^{k}_{ij}</math> or <math>\{\begin{smallmatrix} k\\ ij \end{smallmatrix}\}</math>)<ref name="christoffel" >{{citation|title=Ueber die Transformation der homogenen Differentialausdrücke zweiten Grades|last=Christoffel|first=E.B.|author-link=Elwin Bruno Christoffel|journal=Jour. für die reine und angewandte Mathematik|volume=B. 70|pages=46–70|year=1869|url=http://gdz.sub.uni-goettingen.de/dms/load/img/?PPN=GDZPPN002153882&IDDOC=266356}}</ref><ref name="chatterjee"/> are defined as the unique coefficients such that the equation | |||
:<math>\nabla_i \mathrm{e}_j = \Gamma^k{}_{ij}\mathrm{e}_k</math> | |||
holds, where <math>\nabla_i</math> is the [[Levi-Civita connection]] on ''M'' taken in the coordinate direction <math>\mathrm{e}_{i}</math>, i.e., <math>\nabla_i\equiv \nabla_{\mathrm{e}_i}</math> and where <math>\mathrm{e}_i=\partial_i</math> is a local coordinate ([[holonomic basis|holonomic]]) [[basis of a vector space|basis]]. | |||
The Christoffel symbols can be derived from the vanishing of the [[covariant derivative]] of the [[metric tensor]] <math>g_{ik}\ </math>: | |||
== | :<math>0 = \nabla_\ell g_{ik}= | ||
\frac{\partial g_{ik}}{\partial x^\ell}- g_{mk}\Gamma^m{}_{i\ell} - g_{im}\Gamma^m{}_{k\ell} | |||
= | |||
\frac{\partial g_{ik}}{\partial x^\ell}- 2g_{m(k}\Gamma^m{}_{i)\ell}. | |||
\ | |||
</math> | |||
As a shorthand notation, the [[nabla symbol]] and the partial derivative symbols are frequently dropped, and instead a semi-colon and a comma are used to set off the index that is being used for the derivative. Thus, the above is sometimes written as | |||
:<math>0 = \,g_{ik;\ell} = g_{ik,\ell} - g_{mk} \Gamma^m{}_{i\ell} - g_{im} \Gamma^m{}_{k\ell}. \ </math> | |||
== | Using the fact that the symbols are symmetric in the lower two indices, one can solve explicitly for the Christoffel symbols as a function of the metric tensor by permuting the indices and resumming:<ref name="bishopgoldberg" >{{citation | last1=Bishop|first1=R.L.|last2=Goldberg|first2=|title=Lectures on Classical Differential Geometry|year=1968|page=241}}</ref> | ||
:<math>\Gamma^i{}_{k\ell}=\frac{1}{2}g^{im} \left(\frac{\partial g_{mk}}{\partial x^\ell} + \frac{\partial g_{m\ell}}{\partial x^k} - \frac{\partial g_{k\ell}}{\partial x^m} \right) = {1 \over 2} g^{im} (g_{mk,\ell} + g_{m\ell,k} - g_{k\ell,m}), \ </math> | |||
where <math>(g^{jk})\,</math> is the inverse of the [[matrix (mathematics)|matrix]] <math>(g_{jk})\,</math>, defined as (using the [[Kronecker delta]], and [[Einstein notation]] for summation) | |||
<math>g^{j i} g_{i k}= \delta^j{}_k\ </math>. | |||
Although the Christoffel symbols are written in the same notation as [[Classical treatment of tensors|tensors with index notation]], they are '''not''' [[tensor]]s,<ref>See, for example, {{harv|Kreyszig|1991}}, page 141</ref> | |||
since they do not transform like tensors under a change of coordinates; see [[#Change of variable|below]]. | |||
== | ===Connection coefficients in a non holonomic basis=== | ||
The Christoffel symbols are most typically defined in a coordinate basis, which is the convention followed here. In other words, the name '''Christoffel symbols''' is reserved only for coordinate (i.e., holonomic) frames. However, the connection coefficients can also be defined in an arbitrary (i.e., non holonomic) basis of tangent vectors <math>\mathbf{u}_i</math> by | |||
:<math>\nabla_{\mathbf{u}_i}\mathbf{u}_j = \omega^k{}_{ij}\mathbf{u}_k.</math> | |||
Explicitly, in terms of the metric tensor, this is<ref name="wolfram2ndkind">http://mathworld.wolfram.com/ChristoffelSymboloftheSecondKind.html.</ref> | |||
:<math>\omega^i{}_{k\ell}=\frac{1}{2}g^{im} \left( | |||
g_{mk,\ell} + g_{m\ell,k} - g_{k\ell,m} + | |||
c_{mk\ell}+c_{m\ell k} - c_{k\ell m} | |||
\right)\,</math> | |||
where <math>c_{k\ell m}=g_{mp} {c_{k\ell}}^p\ </math> are the [[commutator#Ring theory|commutation coefficients]] of the basis; that is, | |||
:<math>[\mathbf{u}_k,\mathbf{u}_\ell] = c_{k\ell}{}^m \mathbf{u}_m\,\ </math> | |||
where <math>\mathbf{u}_k</math> are the basis [[vector space|vector]]s and <math>[{\,},{\,}]\ </math> is the [[Lie derivative|Lie bracket]]. The standard unit vectors in [[vector fields in cylindrical and spherical coordinates|spherical and cylindrical coordinates]] furnish an example of a basis with non-vanishing commutation coefficients. | |||
== | ===Ricci rotation coefficients (asymmetric definition)=== | ||
When we choose the basis <math>\mathrm{X}_i\equiv \mathbf{u}_i</math> orthonormal: <math>g_{ab} \equiv \eta_{ab} = \langle X_a, X_b\rangle</math> then <math>g_{mk,\ell}\equiv\eta_{mk,\ell}=0</math>. This implies that | |||
:<math>\omega^i{}_{k\ell}=\frac{1}{2}\eta^{im} \left( | |||
c_{mk\ell}+c_{m\ell k} - c_{k\ell m} | |||
\right)\,</math> | |||
and the connection coefficients become antisymmetric in the first two indices: | |||
:<math>\omega_{abc} = - \omega_{bac}\, ,</math> | |||
where <math>\omega_{abc} = \eta_{ad}\omega^d{}_{bc}\,</math>. | |||
In this case, the connection coefficients <math>\omega^a{}_{bc}</math> are called the '''Ricci rotation coefficients'''.<ref>{{cite journal|title=Dei sistemi di congruenze ortogonali in una varietà qualunque|author=G. Ricci-Curbastro|journal=Mem. Acc. Lincei |volume=2|year=1896|pages=276–322|issue=5}}</ref><ref>{{cite journal|title=Ricci's coefficients of rotation|author=H. Levy|journal=Bull. Amer. Math. |volume=31|year=1925|pages=142–145|issue=3-4|url=http://projecteuclid.org/DPubS?service=UI&version=1.0&verb=Display&handle=euclid.bams/1183486405}}</ref> | |||
== | Equivalently, one can define Ricci rotation coefficients as follows:<ref name="wolfram2ndkind" /> | ||
:<math>\omega^k{}_{ij} := {{\mathbf{u}}}^k \cdot \left( \nabla_j {{\mathbf{u}}}_i \right)\, ,</math> | |||
where <math>\mathbf{u}_i</math> is an orthonormal non holonomic basis | |||
and <math>\mathbf{u}^k=\eta^{k\ell}\mathbf{u}_{\ell}\,</math> its ''co-basis''. | |||
==Relationship to index-free notation== | |||
Let ''X'' and ''Y'' be [[vector fields]] with components <math>X^i\ </math> and <math>Y^k\ </math>. Then the ''k''th component of the covariant derivative of ''Y'' with respect to ''X'' is given by | |||
:<math>\left(\nabla_X Y\right)^k = X^i (\nabla_i Y)^k = X^i \left(\frac{\partial Y^k}{\partial x^i} + \Gamma^k{}_{im} Y^m\right).\ </math> | |||
== | Here, the [[Einstein notation]] is used, so repeated indices indicate summation over indices and contraction with the metric tensor serves to raise and lower indices: | ||
:<math>g(X,Y) = X^i Y_i = g_{ik}X^i Y^k = g^{ik}X_i Y_k.\ </math> | |||
Keep in mind that <math>g_{ik}\neq g^{ik}\ </math> and that <math>g^i {}_k=\delta^i {}_k\ </math>, the [[Kronecker delta]]. The convention is that the metric tensor is the one with the lower indices; the correct way to obtain <math>g^{ik}\ </math> from <math>g_{ik}\ </math> is to solve the linear equations <math>g^{ij}g_{jk}=\delta^i {}_k\ </math>. | |||
== | The statement that the connection is [[torsion tensor|torsion]]-free, namely that | ||
:<math>\nabla_X Y - \nabla_Y X = [X,Y]\ </math> | |||
is equivalent to the statement that —in a coordinate basis— the Christoffel symbol is symmetric in the lower two indices: | |||
:<math>\Gamma^i{}_{jk}=\Gamma^i{}_{kj}.\ </math> | |||
The index-less transformation properties of a tensor are given by [[pullback (differential geometry)|pullbacks]] for covariant indices, and [[pushforward (differential)|pushforwards]] for contravariant indices. The article on [[Covariant derivative#Coordinate description|covariant derivatives]] provides additional discussion of the correspondence between index-free notation and indexed notation. | |||
== | ==Covariant derivatives of tensors== | ||
The '''[[covariant derivative]]''' of a vector field <math>V^m\ </math> is | |||
:<math>\nabla_\ell V^m = \frac{\partial V^m}{\partial x^\ell} + \Gamma^m{}_{k\ell} V^k.\ </math> | |||
The covariant derivative of a scalar field <math>\varphi\ </math> is just | |||
:<math>\nabla_i \varphi = \frac{\partial \varphi}{\partial x^i}\ </math> | |||
= | and the covariant derivative of a [[covector]] field <math>\omega_m\ </math> is | ||
:<math>\nabla_\ell \omega_m = \frac{\partial \omega_m}{\partial x^\ell} - \Gamma^k{}_{\ell m} \omega_k.\ </math> | |||
The symmetry of the Christoffel symbol now implies | |||
:<math>\nabla_i\nabla_j \varphi = \nabla_j\nabla_i \varphi\ </math> | |||
for any scalar field, but in general the covariant derivatives of higher order tensor fields do not commute (see [[Riemann curvature tensor|curvature tensor]]). | |||
The covariant derivative of a type (2,0) [[tensor]] field <math>A^{ik}\ </math> is | |||
:<math>\nabla_\ell A^{ik}=\frac{\partial A^{ik}}{\partial x^\ell} + \Gamma^i{}_{m\ell} A^{mk} + \Gamma^k{}_{m\ell} A^{im}, \ </math> | |||
= | that is, | ||
:<math> A^{ik} {}_{;\ell} = A^{ik} {}_{,\ell} + A^{mk} \Gamma^i{}_{m\ell} + A^{im} \Gamma^k{}_{m\ell}. \ </math> | |||
If the tensor field is [[mixed tensor|mixed]] then its covariant derivative is | |||
:<math> A^i {}_{k;\ell} = A^i {}_{k,\ell} + A^{m} {}_k \Gamma^i{}_{m\ell} - A^i {}_m \Gamma^m{}_{k\ell}, \ </math> | |||
= | and if the tensor field is of type (0,2) then its covariant derivative is | ||
:<math> A_{ik;\ell} = A_{ik,\ell} - A_{mk} \Gamma^m{}_{i\ell} - A_{im} \Gamma^m{}_{k\ell}. \ </math> | |||
==Change of variable== | |||
Under a change of variable from <math>(y^1,\dots,y^n)\ </math> to <math>(x^1,\dots,x^n)\ </math>, vectors transform as | |||
:<math>\frac{\partial}{\partial y^i} = \frac{\partial x^k}{\partial y^i}\frac{\partial}{\partial x^k}\ </math> | |||
= | and so | ||
:<math>\overline{\Gamma^k{}_{ij}} = | |||
\frac{\partial x^p}{\partial y^i}\, | |||
\frac{\partial x^q}{\partial y^j}\, | |||
\Gamma^r{}_{pq}\, | |||
\frac{\partial y^k}{\partial x^r} | |||
+ | |||
\frac{\partial y^k}{\partial x^m}\, | |||
\frac{\partial^2 x^m}{\partial y^i \partial y^j} | |||
\ </math> | |||
where the overline denotes the Christoffel symbols in the ''y'' coordinate system. Note that the Christoffel symbol does '''not''' transform as a tensor, but rather as an object in the [[jet bundle]]. More precisely, the Christoffel symbols can be considered as functions on the jet bundle of the frame bundle of ''M'', independent of any local coordinate system. Choosing a local coordinate system determines a local section of this bundle, which can then be used to pull back the Christoffel symbols to functions on ''M'', though of course these functions then depend on the choice of local coordinate system. | |||
At each point, there exist coordinate systems in which the Christoffel symbols vanish at the point.<ref>This is assuming that the connection is symmetric (e.g., the Levi-Civita connection). If the connection has [[torsion tensor|torsion]], then only the symmetric part of the Christoffel symbol can be made to vanish.</ref> These are called (geodesic) [[normal coordinates]], and are often used in [[Riemannian geometry]]. | |||
==Applications to general relativity== | |||
The Christoffel symbols find frequent use in Einstein's theory of [[general relativity]], where [[spacetime]] is represented by a curved 4-dimensional [[Lorentz manifold]] with a [[Levi-Civita connection]]. The [[Einstein field equations]]—which determine the geometry of spacetime in the presence of matter—contain the [[Ricci tensor]], and so calculating the Christoffel symbols is essential. Once the geometry is determined, the paths of particles and light beams are calculated by [[solving the geodesic equations]] in which the Christoffel symbols explicitly appear. | |||
== | ==See also== | ||
*[[Basic introduction to the mathematics of curved spacetime]] | |||
*[[Proofs involving Christoffel symbols]] | |||
*[[Differentiable manifold]] | |||
*[[List of formulas in Riemannian geometry]] | |||
*[[Ricci calculus]] | |||
*[[Riemann–Christoffel tensor]] | |||
*[[Gauss–Codazzi equations]] | |||
==Notes== | |||
{{Reflist}} | |||
== | ==References== | ||
*{{citation |last1=Abraham |first1=Ralph|authorlink1=Ralph Abraham| first2=Jerrold E.|last2=Marsden|title=Foundations of Mechanics|year=1978|publisher=Benjamin/Cummings Publishing|location=London|isbn=0-8053-0102-X|pages=See chapter 2, paragraph 2.7.1}} | |||
*{{citation | last1=Bishop|first1=R.L.|last2=Goldberg|first2=S.I. | title = Tensor Analysis on Manifolds| publisher=The Macmillan Company | year=1968|edition=First Dover 1980|isbn=0-486-64039-6}} | |||
*{{citation | |||
|last = Choquet-Bruhat | |||
|first = Yvonne | |||
|authorlink = Yvonne Choquet-Bruhat | |||
|first2 = Cécile |last2=DeWitt-Morette| title = Analysis, Manifolds and Physics| publisher = Elsevier| year= 1977| location = Amsterdam |isbn = 978-0-7204-0494-4}} | |||
*{{citation |last1= Landau|first1=Lev Davidovich|authorlink1=Lev Davidovich Landau|first2=Evgeny Mikhailovich|last2=Lifshitz|authorlink2=Evgeny Mikhailovich Lifshitz|title=The Classical Theory of Fields|edition=Fourth Revised English|series=[[Course of Theoretical Physics]]|volume=Volume 2|year=1951|publisher=Pergamon Press|location=Oxford|isbn=0-08-025072-6|pages=See chapter 10, paragraphs 85, 86 and 87}} | |||
*{{Citation | |||
| last = Kreyszig | |||
| first = Erwin | |||
| authorlink = Erwin Kreyszig | |||
| title = Differential Geometry | |||
| publisher = [[Dover Publications]] | |||
| year = 1991 | |||
| isbn = 978-0-486-66721-8 }} | |||
*{{citation |last1=Misner |first1=Charles W.|first2=Kip S.|last2=Thorne | |||
|first3=John Archibald|last3=Wheeler|title=Gravitation|year=1970|publisher=W.H. Freeman | |||
|location=New York|isbn=0-7167-0344-0|pages=See chapter 8, paragraph 8.5}} | |||
*{{citation |last1=Ludvigsen |first1=Malcolm|title=General Relativity: A Geometrical Approach|year=1999|publisher=Cambrigde University Press|isbn=0-521-63019-3}} | |||
* {{citation|last=Spivak|first=Michael|authorlink=Michael Spivak|title=A Comprehensive introduction to differential geometry | |||
|volume=Volume 2 | |||
|year=1999|publisher=Publish or Perish|isbn=0-914098-71-3}} | |||
* {{cite book | |||
|title=Vector & Tensor Analysis | |||
|first1=U. |last1=Chatterjee | |||
|first2=N. |last2=Chatterjee | |||
|publisher=Academic Publishers | |||
|isbn=978-93-8059-905-2 | |||
|year=2010 | |||
|page= | |||
|url=http://books.google.nl/books?id=oTeGXkg0tn0C&pg=PA480}} | |||
* {{cite book | |||
|first1=D.J. |last1=Struik | |||
|year=1961 | |||
|edition=first published in 1988 Dover | |||
|title=Lectures on Classical Differential Geometry | |||
|publisher=Dover | |||
|isbn=0-486-65609-8 | |||
}} | |||
{{tensors}} | |||
{{DEFAULTSORT:Christoffel Symbols}} | |||
[[Category:Riemannian geometry]] | |||
[[Category:Lorentzian manifolds]] | |||
[[Category:Mathematical notation]] | |||
[[Category:Mathematical physics]] | |||
[[Category:Connection (mathematics)]] | |||
Revision as of 20:18, 26 January 2014
In mathematics and physics, the Christoffel symbols, named for Elwin Bruno Christoffel [1] (1829–1900), are numerical arrays of real numbers that describe, in coordinates, the effects of parallel transport in curved surfaces and, more generally, manifolds. As such, they are coordinate-space expressions for the Levi-Civita connection derived from the metric tensor. In a broader sense, the connection coefficients of an arbitrary (not necessarily metric) affine connection in a coordinate basis are also called Christoffel symbols.[2] The Christoffel symbols may be used for performing practical calculations in differential geometry. For example, the Riemann curvature tensor can be expressed entirely in terms of the Christoffel symbols and their first partial derivatives.
At each point of the underlying n-dimensional manifold, for any local coordinate system, the Christoffel symbol is an array with three dimensions: n × n × n. Each of the n3 components is a real number.
Under linear coordinate transformations on the manifold, it behaves like a tensor, but under general coordinate transformations, it does not. In many practical problems, most components of the Christoffel symbols are equal to zero, provided the coordinate system and the metric tensor possess some common symmetries.
In general relativity, the Christoffel symbol plays the role of the gravitational force field with the corresponding gravitational potential being the metric tensor.
Preliminaries
The definitions given below are valid for both Riemannian manifolds and pseudo-Riemannian manifolds, such as those of general relativity, with careful distinction being made between upper and lower indices (contra-variant and co-variant indices). The formulas hold for either sign convention, unless otherwise noted. Einstein summation convention is used in this article. The connection coefficients of the Levi-Civita connection (or pseudo-Riemannian connection) expressed in a coordinate basis are called the Christoffel symbols.
Definition
If xi, i = 1,2,...,n, is a local coordinate system on a manifold M with metric tensor , then the tangent vectors
define a local coordinate basis of the tangent space to M at each point of its domain.
Christoffel symbols of the first kind
The Christoffel symbols of the first kind can be derived either from the Christoffel symbols of the second kind and the metric,[3]
or from the metric alone,[3]
As an alternative notation one also finds[1][4][5]
It is worth noting that .[6]
Christoffel symbols of the second kind (symmetric definition)
The Christoffel symbols of the second kind are the connection coefficients —in a coordinate basis— of the Levi-Civita connection, and since this connection has zero torsion, then in this basis the connection coefficients are symmetric,i.e., .[4] For this reason a torsion-free connection is often called 'symmetric'.
In other words, the Christoffel symbols of the second kind [7][4] (sometimes or )[1][4] are defined as the unique coefficients such that the equation
holds, where is the Levi-Civita connection on M taken in the coordinate direction , i.e., and where is a local coordinate (holonomic) basis.
The Christoffel symbols can be derived from the vanishing of the covariant derivative of the metric tensor :
As a shorthand notation, the nabla symbol and the partial derivative symbols are frequently dropped, and instead a semi-colon and a comma are used to set off the index that is being used for the derivative. Thus, the above is sometimes written as
Using the fact that the symbols are symmetric in the lower two indices, one can solve explicitly for the Christoffel symbols as a function of the metric tensor by permuting the indices and resumming:[6]
where is the inverse of the matrix , defined as (using the Kronecker delta, and Einstein notation for summation) . Although the Christoffel symbols are written in the same notation as tensors with index notation, they are not tensors,[8] since they do not transform like tensors under a change of coordinates; see below.
Connection coefficients in a non holonomic basis
The Christoffel symbols are most typically defined in a coordinate basis, which is the convention followed here. In other words, the name Christoffel symbols is reserved only for coordinate (i.e., holonomic) frames. However, the connection coefficients can also be defined in an arbitrary (i.e., non holonomic) basis of tangent vectors by
Explicitly, in terms of the metric tensor, this is[7]
where are the commutation coefficients of the basis; that is,
where are the basis vectors and is the Lie bracket. The standard unit vectors in spherical and cylindrical coordinates furnish an example of a basis with non-vanishing commutation coefficients.
Ricci rotation coefficients (asymmetric definition)
When we choose the basis orthonormal: then . This implies that
and the connection coefficients become antisymmetric in the first two indices:
In this case, the connection coefficients are called the Ricci rotation coefficients.[9][10]
Equivalently, one can define Ricci rotation coefficients as follows:[7]
where is an orthonormal non holonomic basis and its co-basis.
Relationship to index-free notation
Let X and Y be vector fields with components and . Then the kth component of the covariant derivative of Y with respect to X is given by
Here, the Einstein notation is used, so repeated indices indicate summation over indices and contraction with the metric tensor serves to raise and lower indices:
Keep in mind that and that , the Kronecker delta. The convention is that the metric tensor is the one with the lower indices; the correct way to obtain from is to solve the linear equations .
The statement that the connection is torsion-free, namely that
is equivalent to the statement that —in a coordinate basis— the Christoffel symbol is symmetric in the lower two indices:
The index-less transformation properties of a tensor are given by pullbacks for covariant indices, and pushforwards for contravariant indices. The article on covariant derivatives provides additional discussion of the correspondence between index-free notation and indexed notation.
Covariant derivatives of tensors
The covariant derivative of a vector field is
The covariant derivative of a scalar field is just
and the covariant derivative of a covector field is
The symmetry of the Christoffel symbol now implies
for any scalar field, but in general the covariant derivatives of higher order tensor fields do not commute (see curvature tensor).
The covariant derivative of a type (2,0) tensor field is
that is,
If the tensor field is mixed then its covariant derivative is
and if the tensor field is of type (0,2) then its covariant derivative is
Change of variable
Under a change of variable from to , vectors transform as
and so
where the overline denotes the Christoffel symbols in the y coordinate system. Note that the Christoffel symbol does not transform as a tensor, but rather as an object in the jet bundle. More precisely, the Christoffel symbols can be considered as functions on the jet bundle of the frame bundle of M, independent of any local coordinate system. Choosing a local coordinate system determines a local section of this bundle, which can then be used to pull back the Christoffel symbols to functions on M, though of course these functions then depend on the choice of local coordinate system.
At each point, there exist coordinate systems in which the Christoffel symbols vanish at the point.[11] These are called (geodesic) normal coordinates, and are often used in Riemannian geometry.
Applications to general relativity
The Christoffel symbols find frequent use in Einstein's theory of general relativity, where spacetime is represented by a curved 4-dimensional Lorentz manifold with a Levi-Civita connection. The Einstein field equations—which determine the geometry of spacetime in the presence of matter—contain the Ricci tensor, and so calculating the Christoffel symbols is essential. Once the geometry is determined, the paths of particles and light beams are calculated by solving the geodesic equations in which the Christoffel symbols explicitly appear.
See also
- Basic introduction to the mathematics of curved spacetime
- Proofs involving Christoffel symbols
- Differentiable manifold
- List of formulas in Riemannian geometry
- Ricci calculus
- Riemann–Christoffel tensor
- Gauss–Codazzi equations
Notes
43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.
References
- Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010 - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010 - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010 - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010 - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010 - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010 - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010 - Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010 - 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 - 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
- ↑ 1.0 1.1 1.2 Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010 - ↑ See, for instance, Template:Harv and Template:Harv
- ↑ 3.0 3.1 Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010 Cite error: Invalid<ref>
tag; name "ludvigsen" defined multiple times with different content - ↑ 4.0 4.1 4.2 4.3 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 Cite error: Invalid<ref>
tag; name "chatterjee" defined multiple times with different content - ↑ 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 - ↑ 6.0 6.1 Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.
Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010 Cite error: Invalid<ref>
tag; name "bishopgoldberg" defined multiple times with different content - ↑ 7.0 7.1 7.2 http://mathworld.wolfram.com/ChristoffelSymboloftheSecondKind.html.
- ↑ See, for example, Template:Harv, page 141
- ↑ One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting
In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang
Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules
Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.
A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang - ↑ One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting
In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang
Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules
Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.
A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang - ↑ This is assuming that the connection is symmetric (e.g., the Levi-Civita connection). If the connection has torsion, then only the symmetric part of the Christoffel symbol can be made to vanish.