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Oscar Randal-Williams's user avatar
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Oscar Randal-Williams
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question
80
Topological cobordisms between smooth manifolds
Jun 5, 2015
answer
58
Examples where it's useful to know that a mathematical object belongs to some family of objects
Sep 1, 2011
answer
37
All fiber bundles over $S^2$ extendable to $\mathbb{C}P^\infty$?
Oct 21, 2016
answer
34
Manifold embedded in $R^{n+1}$ with a submanifold that doesn't embed in $R^n$
Nov 8, 2016
answer
32
Fundamental group of a topological pullback
May 30, 2013
answer
31
Does a "Chern character" exist for any generalized cohomology theory?
Jun 23, 2010
answer
26
Approximation of homeomorphism by diffeomorphism
Dec 18, 2019
answer
26
Mumford conjecture: Heuristic reasons? Generalizations? ... Algebraic geometry approaches?
Jan 10, 2010
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26
Homology theory represented by Madsen-Tillmann spectra
Aug 25, 2014
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23
Square root of the determinant line
Oct 10, 2017
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How to typeset $:=$ correctly?
6
Exercise in Spanier to get universal coefficient theorem for cohomology with local coefficients