Victor's user avatar
Victor's user avatar
Victor's user avatar
Victor
  • Member for 13 years, 5 months
  • Last seen more than a week ago
17 votes
3 answers
1k views

Is a retract of a free object free?

12 votes
1 answer
499 views

Unknotted $S^{n-2}$ in $S^n$

11 votes
1 answer
803 views

Colimits, limits, and mapping spaces

11 votes
2 answers
362 views

index of morse functions and homotopical dimension

11 votes
1 answer
422 views

Haefliger trefoil $S^3\hookrightarrow S^6$

10 votes
3 answers
5k views

when mapping cone is contractible

10 votes
2 answers
689 views

Mapping space from a quotient space

9 votes
2 answers
364 views

Quillen equivalence for under-categories

7 votes
0 answers
285 views

Tensor-hom adjunction in a general closed monoidal category

6 votes
1 answer
331 views

Invertible 2-knots in $S^4$

6 votes
1 answer
330 views

Embedding theory for contractible manifolds

5 votes
1 answer
538 views

Semicosimplicial totalization

5 votes
1 answer
341 views

Model structures on the category of unbounded chain complexes

5 votes
0 answers
240 views

Finite CDGA model for a compact manifold

5 votes
1 answer
167 views

$\operatorname{STop}_{n,n-2}\simeq S^1$?

4 votes
1 answer
129 views

Concordance classes of diffeomorphisms of $D^4$

4 votes
2 answers
786 views

Generalized Jordan theorem and winding number

4 votes
1 answer
1k views

Abelian subcategory

3 votes
0 answers
117 views

Mapping spaces for triples

1 vote
1 answer
173 views

Is $\operatorname{PL}_{n,n-1}$ contractible?