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Jan
20
revised Parallelizability of the Milnor's exotic spheres in dimension 7
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Oct
14
answered fiber, homotopy fiber of spaces
Oct
14
comment fiber, homotopy fiber of spaces
No, the Vietoris-Begle theorem only holds for proper maps.
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Jun
28
comment Automorphism group of a fiber bundle surjects onto diffeomorphism group?
If $P$ is a natural fibre bundle, then - by definition - any diffeomorphism is covered by a bundle automorphism.
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Feb
17
revised Homotopy spheres with vanishing and non-vanishing $\alpha$-invariant
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Jan
7
answered The periodic values in Bott periodicity