Omar Antolín-Camarena's user avatar
Omar Antolín-Camarena's user avatar
Omar Antolín-Camarena's user avatar
Omar Antolín-Camarena
  • Member for 14 years, 5 months
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51 votes
2 answers
6k views

Which colimits commute with which limits in the category of sets?

33 votes
0 answers
2k views

Is there a (discrete) monoid M injecting into its group completion G for which BM is not homotopy equivalent to BG?

27 votes
7 answers
4k views

In what sense are fields an algebraic theory?

18 votes
1 answer
727 views

Is a field that never embeds twice in another field necessarily a prime field?

17 votes
1 answer
1k views

Which limits commute with filtered colimits in the category of sets?

16 votes
0 answers
584 views

What are some examples of weak ω-categories?

16 votes
1 answer
2k views

Homotopy fiber of a map between classifying spaces

15 votes
2 answers
826 views

Turning simplicial complexes into simplicial sets without ordering the vertices

14 votes
1 answer
700 views

For which $n$ is there a regular $n$-simplex with vertices in $\mathbb{Z}^n$?

9 votes
2 answers
1k views

Is there a description of sheaf cohomology in algebraic-topological terms?

5 votes
1 answer
449 views

What is an example of a colimit-dense generator which is not dense?

2 votes
1 answer
635 views

Is there an irreducible integral polynomial in two variables which is reducible for every value of one of the variables?

1 vote
0 answers
143 views

Reference request for the list of nilpotent subgroups of SU(2)?