Adam Epstein's user avatar
Adam Epstein's user avatar
Adam Epstein's user avatar
Adam Epstein
  • Member for 12 years, 9 months
  • Last seen this week
23 votes
4 answers
3k views

When must it be sets rather than proper classes, or vice-versa, outside of foundational mathematics?

23 votes
2 answers
3k views

Who named it the Snake Lemma?

11 votes
2 answers
2k views

Category of topological spaces with open or closed maps

14 votes
1 answer
2k views

Finite dimensional real division algebras

14 votes
1 answer
1k views

Can one exhibit an explicit Kuratowski infinite set without invoking Replacement?

11 votes
2 answers
1k views

Cardinality of connected manifolds

15 votes
1 answer
773 views

Essential uniqueness of the real-analytic structure on $\mathbb R$

13 votes
0 answers
747 views

Algebraic proofs of algebraic theorems about algebraically closed fields

10 votes
1 answer
631 views

Absoluteness of well-orderability

13 votes
0 answers
494 views

How much choice is required to prove concretizability theorems in category theory?

4 votes
1 answer
253 views

Forcing over the poset of nonempty open subsets of a nice topological space