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Double suspension theorem
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Double suspension theorem : ウィキペディア英語版
Double suspension theorem
In geometric topology, the double suspension theorem of and R. D. Edwards states that the double suspension ''S''2''X'' of a homology sphere ''X'' is a topological sphere.
If ''X'' is a piecewise-linear homology sphere but not a sphere, then its double suspension ''S''2''X'' (with a triangulation derived by applying the double suspension operation to a triangulation of ''X'') is an example of a triangulation of a topological sphere that is not piecewise-linear. The reason is that, unlike in piecewise-linear manifolds, the link of one of the suspension points is not a sphere.
==References==

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抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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