45

Questions

6
0
140
views

When is the cohomology cross product square nonzero?

jun 20 at 16:10 Mark Grant 9,06111435

1
5
5
644
views

Advantages of the sequence definition of limits

may 5 at 20:06 Amir Asghari 185413

3
5
2
322
views

Submersions of closed manifolds

apr 13 12 at 8:11 Neil Strickland 13.6k12867

5
5
2
510
views

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

aug 25 11 at 0:50 Frank Williams 361

1
4
5
567
views

Generalised linking numbers (where they shouldn’t be)

sep 13 11 at 20:29 mikhail skopenkov 966213

4
3
581
views

Do there exist closed symplectic manifolds with Euler characteristic zero?

jan 9 11 at 19:14 Mohammad F.Tehrani 2,500314

2
4
1
416
views

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

jan 13 11 at 22:10 Igor Rivin 31.2k33771

1
4
1
263
views

Homotopy dimension of a mapping

mar 1 11 at 4:42 John Klein 7,2161928

1
4
1
297
views

Minimal models with local coefficients

jun 6 11 at 18:48 algori 16k12994

2
3
1
223
views

Relative Hirsch number

jun 10 11 at 21:18 Max 2,227815