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Questions
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36
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15
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Are there examples of non-orientable manifolds in nature?

feb 14 12 at 0:24 Joseph O'Rourke 43.1k●1●49●214

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19
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3
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789
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Configuration space of little disks inside a big disk

aug 30 11 at 2:50 Matthew Kahle 4,058●7●28

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18
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2
answers
655
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When does a homomorphism factor through a free group?

aug 1 at 9:42 Mark Grant 9,061●1●13●33

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15
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2
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489
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Proofs of the Stallings-Swan theorem

jun 6 at 13:45 Mark Grant 9,061●1●13●33

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13
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3
answers
355
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Does this subgroup of “even braids” have a name?

feb 12 at 18:05 Martin Palmer 51●2

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12
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1
answer
372
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Formal group law of unoriented cobordism

sep 7 11 at 23:06 Neil Strickland 13.3k●1●28●66

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11
votes
0
answers
341
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Steenrod algebra at a prime power

sep 13 at 11:59 Mark Grant 9,061●1●13●33

 
10
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1
answer
310
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Wanted: Odd-dimensional integral cohomology class whose square is nonzero

aug 29 at 11:49 Mark Grant 9,061●1●13●33

 
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2
answers
535
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Cohomological dimension of a homomorphism

feb 24 12 at 14:31 Mark Grant 9,061●1●13●33

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9
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1
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467
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Which cohomology theories are real- and complex-orientable?

feb 17 11 at 12:28 Neil Strickland 13.3k●1●28●66

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