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7 votes
1 answer
170 views

Circle action on free loop space of a classifying space

2 votes
1 answer
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Superlevel sets of a parametrized quadratic forms

2 votes
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Homotopy class of certain loops in $\mathit{SO}(n)$

14 votes
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479 views

Exotic sphere without smooth antipodal map

5 votes
1 answer
435 views

A space homotopy dominated by a wedge of spheres

6 votes
1 answer
473 views

Construction of algebra objects

15 votes
3 answers
1k views

Categories on which one can determine all model structures?

18 votes
1 answer
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The homology of the orbit space

41 votes
1 answer
7k views

Classification of surfaces and the TOP, DIFF and PL categories for manifolds

8 votes
1 answer
244 views

$K$-theory of free $M$-sets, with $M$ a monoid

4 votes
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181 views

Can we realize any triple linking number of 3-surfaces in 5-manifolds?

0 votes
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48 views

Finding "simple loops" on top of a ramified cover

11 votes
2 answers
501 views

Chern classes in Čech cohomology

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How nilpotent is the ring of stable homotopy groups of spheres?

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