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[[Image:Monkey Saddle Surface (Shaded).png|thumb|The monkey saddle|300px]]
In [[mathematics]], the '''monkey saddle''' is the [[surface]] defined by the equation
 
:<math> z = x^3 - 3xy^2. \, </math>
 
It belongs to the class of [[saddle surface]]s and its name derives from the observation that a [[saddle]] for a [[monkey]] requires three depressions: two for the legs, and one for the tail. The point (0,0,0) on the monkey saddle corresponds to a [[critical point (mathematics)|degenerate critical point]] of the function ''z''(''x'',''y'') at (0, 0). The monkey saddle has an isolated [[umbilical point]] with zero [[Gaussian curvature]] at the origin, while the curvature is strictly negative at all other points.
 
To show that the monkey saddle has three depressions, one can write the equation for ''z'' using [[complex number]]s as
:<math> z(x,y) = \operatorname{Re} (x+iy)^3.</math>
It follows that ''z''(''tx'',''ty'') = ''t''<sup>3</sup> ''z''(''x'',''y'') for ''t'' ≥ 0, so the surface is determined by ''z'' on the [[unit circle]]. Parametrizing this by ''e''<sup>''i''φ</sup>, with φ ∈ [0, 2π), one can see that on the unit circle, ''z''(φ) = cos 3φ, so ''z'' has three depressions. By replacing 3 with any integer ''k'' ≥ 1, one can create a saddle with ''k'' depressions.
 
== Horse saddle ==
 
The term ''horse saddle'' is used, in contrast to monkey saddle, to designate a [[saddle point]] that is a [[minimax]], that is to say a local minimum or maximum depending on the intersecting plane used. The monkey saddle has just a [[point of inflection]]. To see this, consider a line ''y'' = ''kx''. Along this direction the surface becomes simply ''z'' = (1 &minus; 3''k''<sup>2</sup>)''x''<sup>3</sup>, lacking any critical points.
 
== See also==
* [[Saddle point]]
*[[Saddle surface]]
 
==External links==
* {{MathWorld | urlname=MonkeySaddle | title=Monkey Saddle}}
 
[[Category:Multivariable calculus]]
[[Category:Surfaces]]

Revision as of 12:29, 13 March 2013

The monkey saddle

In mathematics, the monkey saddle is the surface defined by the equation

It belongs to the class of saddle surfaces and its name derives from the observation that a saddle for a monkey requires three depressions: two for the legs, and one for the tail. The point (0,0,0) on the monkey saddle corresponds to a degenerate critical point of the function z(x,y) at (0, 0). The monkey saddle has an isolated umbilical point with zero Gaussian curvature at the origin, while the curvature is strictly negative at all other points.

To show that the monkey saddle has three depressions, one can write the equation for z using complex numbers as

It follows that z(tx,ty) = t3 z(x,y) for t ≥ 0, so the surface is determined by z on the unit circle. Parametrizing this by eiφ, with φ ∈ [0, 2π), one can see that on the unit circle, z(φ) = cos 3φ, so z has three depressions. By replacing 3 with any integer k ≥ 1, one can create a saddle with k depressions.

Horse saddle

The term horse saddle is used, in contrast to monkey saddle, to designate a saddle point that is a minimax, that is to say a local minimum or maximum depending on the intersecting plane used. The monkey saddle has just a point of inflection. To see this, consider a line y = kx. Along this direction the surface becomes simply z = (1 − 3k2)x3, lacking any critical points.

See also

External links



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