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Jun 21, 2012 at 0:26 comment added Sergey Melikhov ... and it was known from the very beginning that every triangulation of a ball has a stellar subdivision that is collapsible (Theorem 7 in Simplicial spaces, nuclei, and $m$-groups). Whitehead's papers are always an inspiring reading. maths.ed.ac.uk/~aar/papers/jhcw9.pdf
May 15, 2012 at 0:02 history edited Sergey Melikhov CC BY-SA 3.0
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May 14, 2012 at 23:33 history edited Sergey Melikhov CC BY-SA 3.0
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Feb 7, 2012 at 2:38 vote accept Andy Soffer
Feb 6, 2012 at 14:09 history answered Sergey Melikhov CC BY-SA 3.0