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Peter Kropholler

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12 votes

Is there a notion of 'amenable ring'

ac.commutative-algebra ra.rings-and-algebras amenability asked May 27, 2018 at 12:03
mathoverflow.net

12 votes

What is the least $n\ge1$ for which there is an $n$-dimensional closed flat manifold with perfect fundamental group?

gr.group-theory geometric-group-theory group-cohomology asked Dec 22, 2022 at 15:27
mathoverflow.net

10 votes

Are condensed vector spaces over finite fields always solid?

ct.category-theory finite-fields tensor-products abelian-groups condensed-mathematics asked Jan 14, 2022 at 10:42
mathoverflow.net

9 votes

Group extensions with non-abelian kernel

gr.group-theory homological-algebra group-cohomology asked May 6, 2021 at 14:41
mathoverflow.net

8 votes

Calculation of boundary of slant product in W. S. Massey's Singular Homology textbook

at.algebraic-topology asked Jul 30, 2022 at 12:41
mathoverflow.net

7 votes

In search of a quick proof that groups acting freely on $\mathbb R$-trees are linear

gr.group-theory geometric-group-theory trees asked Dec 21, 2022 at 12:21
mathoverflow.net

6 votes

Singular homology using singular cubes

at.algebraic-topology gt.geometric-topology homology asked Jul 30, 2022 at 12:22
mathoverflow.net

6 votes

Amenable groups with all subgroups finitely generated

gr.group-theory asked Jun 7, 2020 at 10:48
mathoverflow.net

5 votes

Mordell's theorem on rational quadrilaterals

mg.metric-geometry euclidean-geometry asked Sep 19, 2019 at 13:53
mathoverflow.net

5 votes

Cohomology of a countable directed union of groups

gr.group-theory homological-algebra higher-category-theory group-cohomology asked Dec 15, 2022 at 11:30
mathoverflow.net

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