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# Questions

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### Homology theory constructed in a homotopy-invariant way

sep 29 at 21:18 Ronnie Brown 5,2871920

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### Is every closed set of Q² the intersection of some connected closed set of R² with Q²

may 16 11 at 12:25 over 1

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### Forcing over an arbitrary model of ZFC

jan 6 11 at 1:57 Jason 1,9441516

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### Topological spaces whose continuous image is always closed

oct 23 10 at 7:52 Pietro Majer 19.7k12469

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753
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### Ricci flow with surgery in dimension 2

dec 7 10 at 22:29 Dan Lee 43315

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### Homotopy groups of spheres in a $(\infty, 1)$-topos

oct 27 11 at 21:17 Charles Rezk 12.9k13166

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### Large cardinal axiom: everything that happen once must happen an unbounded number of times

nov 9 11 at 0:02 Joel David Hamkins 75.5k8189347

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### End point compactification for metric spaces

oct 28 10 at 12:10 François G. Dorais 22.7k249114

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### Abelian groups as fundamental groups of topological groups

nov 11 10 at 16:02 Georges Elencwajg 24.3k65132

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