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Whitehead manifold

open 3-manifold that is contractible, but not homeomorphic to R³

en-US/ˈwaɪtˌhɛd ˈmænəˌfoʊld/
en-GB/ˈwaɪthɛd ˈmænɪfəʊld/

Categories:

contractible spacetopological manifold3-manifold