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Contractible space - Wikipedia
In mathematics, a topological space X is contractible if the identity map on X is null-homotopic, i.e. if it is homotopic to some constant map. Intuitively, a contractible space is one that can be continuously shrunk to a point within that space. See more
A contractible space is precisely one with the homotopy type of a point. It follows that all the homotopy groups of a contractible space are trivial. Therefore any space with a … See more
A topological space X is locally contractible at a point x if for every neighborhood U of x there is a neighborhood V of x contained in U such that the inclusion of … See more
• Fake 4-ball – Mathematical topological manifold See more
• Any Euclidean space is contractible, as is any star domain on a Euclidean space.
• The Whitehead manifold is contractible.
• Spheres of any finite dimension are not contractible. See moreWikipedia text under CC-BY-SA license Contractible space - Encyclopedia of Mathematics
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