Skip to main content

Explore our questions

3 votes
1 answer
349 views

A question about spectral sequences

2 votes
0 answers
46 views

Reference request for a theorem of Jaworowski

4 votes
0 answers
75 views

Does a "good" homotopy equivalence between pairs imply homotopy equivalence between quotient spaces?

0 votes
0 answers
62 views

A topological space has the homotopy-type of a CW-complex, then is it locally contractible?

6 votes
0 answers
156 views
+50

Isotopy classes of $CP^1$ in 4-manifolds

2 votes
1 answer
200 views

Superlevel sets of a parametrized quadratic forms

0 votes
0 answers
47 views

Can an upper hemicontinuous correspondence be discountinuous everywhere?

5 votes
0 answers
71 views

Connectivity of a induced map between homotopy pullbacks

22 votes
2 answers
2k views

When is a topological space the homotopy colimit of an open covering?

2 votes
0 answers
119 views

details of a dévissage argument for constructible sheaves

2 votes
0 answers
155 views

A $\mathbb{Z}_2$-equivariant map from $n$-torus to $2$-sphere that is null-homotopic is $\mathbb{Z}_2$-homotopic to a non-surjective map?

3 votes
2 answers
220 views

Explicit description of transfer for $K_1$

0 votes
0 answers
58 views

Large volume growth of covering space

8 votes
1 answer
445 views

A question about cohomology of the classifying spaces of compact groups

Browse more Questions