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arxiv: 0910.0531 · v1 · submitted 2009-10-03 · 🧮 math.AT · math.GN

On noncontractible compacta with trivial homology and homotopy groups

classification 🧮 math.AT math.GN
keywords groupstrivialclassicalhomologyhomotopynoncontractiblesingularborel-moore
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We construct an example of a Peano continuum $X$ such that: (i) $X$ is a one-point compactification of a polyhedron; (ii) $X$ is weakly homotopy equivalent to a point (i.e. $\pi_n(X)$ is trivial for all $n \geq 0$); (iii) $X$ is noncontractible; and (iv) $X$ is homologically and cohomologically locally connected (i.e. $X$ is a $HLC$ and $clc$ space). We also prove that all classical homology groups (singular, \v{C}ech, and Borel-Moore), all classical cohomology groups (singular and \v{C}ech), and all finite-dimensional Hawaiian groups of $X$ are trivial.

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