45

Questions
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When is the cohomology cross product square nonzero?

jun 20 at 16:10 Mark Grant 9,061●1●14●35

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644
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Advantages of the sequence definition of limits

may 5 at 20:06 Amir Asghari 185●4●13

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322
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Submersions of closed manifolds

apr 13 12 at 8:11 Neil Strickland 13.6k●1●28●67

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510
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Steenrod squares in the cohomology of $BO(k)$

aug 25 11 at 0:50 Frank Williams 36●1

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567
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Generalised linking numbers (where they shouldn’t be)

sep 13 11 at 20:29 mikhail skopenkov 966●2●13

 
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3
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581
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Do there exist closed symplectic manifolds with Euler characteristic zero?

jan 9 11 at 19:14 Mohammad F.Tehrani 2,500●3●14

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416
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Is there a smooth free circle action on the Klein bottle?

jan 13 11 at 22:10 Igor Rivin 31.2k●3●37●71

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263
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Homotopy dimension of a mapping

mar 1 11 at 4:42 John Klein 7,216●19●28

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297
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Minimal models with local coefficients

jun 6 11 at 18:48 algori 16k●1●29●94

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223
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Relative Hirsch number

jun 10 11 at 21:18 Max 2,227●8●15

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