Mean absolute percentage error

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The pseudocircle is the finite topological space X consisting of four distinct points {a,b,c,d} with the following non-Hausdorff topology:

{{a,b,c,d},{a,b,c},{a,b,d},{a,b},{a},{b},}. This topology corresponds to the partial order a<c,b<c,a<d,b<d where open sets are downward closed sets.

X is highly pathological from the usual viewpoint of general topology as it fails to satisfy any separation axiom besides T0. However from the viewpoint of algebraic topology X has the remarkable property that it is indistinguishable from the circle S1.

More precisely the continuous map f from S1 to X (where we think of S1 as the unit circle in R2) given by

f(x,y)={ax<0bx>0c(x,y)=(0,1)d(x,y)=(0,1)

is a weak homotopy equivalence, that is f induces an isomorphism on all homotopy groups. It follows (proposition 4.21 in Hatcher) that f also induces an isomorphism on singular homology and cohomology and more generally an isomorphism on all ordinary or extraordinary homology and cohomology theories (e.g., K-theory).

This can be proved using the following observation. Like S1, X is the union of two contractible open sets {a,b,c} and {a,b,d} whose intersection {a,b} is also the union of two disjoint contractible open sets {a} and {b}.

More generally McCord has shown that for any finite simplicial complex K, there is a finite topological space XK which has the same weak homotopy type as the geometric realization |K| of K. More precisely there is a functor, taking K to XK, from the category of finite simplicial complexes and simplicial maps and a natural weak homotopy equivalence from |K| to XK.

References

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  2. Algebraic Topology, by Allen Hatcher, Cambridge University Press, 2002.