40

Questions
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19
18
votes
7
answers
2k
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understanding Steenrod squares

mar 29 10 at 8:50 Dev Sinha 2,470●10●20

4
6
votes
2
answers
1k
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the hopf invariant of the hopf construction

aug 14 10 at 13:21 Tom Goodwillie 27k●2●62●111

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13
votes
5
answers
1k
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two conjugate subgroups and one is a proper subset of the other? plus, a covering space interpretation.

jan 16 10 at 18:20 Vipul Naik 4,935●13●43

11
21
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3
answers
955
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How can we detect the existence of almost-complex structures?

may 3 11 at 20:45 Joel Fine 3,841●1●12●30

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16
votes
7
answers
892
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probabilistic knot theory

nov 10 09 at 3:11 Sam Nead 5,627●12●27

4
11
votes
3
answers
883
views

cohomology and Eilenberg-MacLane spaces

aug 1 10 at 17:13 Sean Tilson 2,394●9●26

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13
votes
4
answers
779
views

Can one use Atiyah-Singer to prove that the Chern-Weil definition of Chern classes are $\mathbb{Z}$-cohomology classes?

jun 30 11 at 13:28 Paul Siegel 9,715●2●33●75

2
2
votes
3
answers
738
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free homotopy groups — when do they exist?

nov 19 09 at 20:18 Ilya Nikokoshev 9,019●5●30●73

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5
votes
2
answers
723
views

How should I think about delooping?

oct 9 10 at 21:13 Kevin Lin 13k●2●34●115

1
1
vote
3
answers
673
views

singular cohomology of SO(4)

oct 21 09 at 10:04 skupers 3,119●6●26

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