User IJL

4 votes

Are geodesics necessarily embedded?

answered Dec 5, 2022 at 15:14

4 votes

Accepted

Defining the classifying space of a group acting on a set

answered Feb 6, 2023 at 20:41

4 votes

Accepted

About Čech cohomology in transformation groups

answered Feb 27 at 10:19

4 votes

Accepted

Higher cohomology for trivial module for finite groups of Lie type

answered May 21, 2019 at 16:03

4 votes

Cellular homology of the universal cover

answered Mar 1, 2021 at 21:13

4 votes

Decidability of word problem for group admitting certain action

answered Jul 10, 2021 at 13:20

4 votes

Dimension of classifying space of a group

answered Oct 12, 2020 at 14:51

3 votes

Groups acting on products of hyperbolic spaces

answered Apr 21, 2021 at 8:46

3 votes

Accepted

An acyclic simplicial complex where all links are generalised homology spheres

answered Jun 23, 2021 at 15:38

3 votes

Construction of representations of the Mathieu groups?

answered Feb 14, 2019 at 14:19

3 votes

What is the minimal dimension of a complex realising a group representation?

answered Jul 18, 2018 at 11:41

3 votes

Accepted

Cohomological variety in case that Sylow subgroup is elementary abelian

answered Oct 7, 2022 at 11:10

3 votes

Automorphism group of a normal tiling of the plane

answered Mar 18, 2022 at 14:24

3 votes

Special cell decomposition for spheres with free $\mathbb{Z}/p\mathbb{Z}$-action by orthogonal transformations?

answered May 26, 2022 at 10:45

2 votes

Kan–Thurston theorem and R-completion

answered Feb 6, 2022 at 15:52

2 votes

Transgression image and Serre spectral sequence for tori

answered Aug 30, 2018 at 15:15

2 votes

Accepted

A question about Wall's construction for CW-complexes

answered Sep 5, 2018 at 11:40

2 votes

Homotopy type of non-Cohen-Macaulay complexes

answered Jan 24, 2020 at 10:56

2 votes

Is the cohomology ring $H^*(BG,\mathbb{Z})$ generated by Euler classes?

answered Jan 24, 2020 at 16:13

2 votes

Accepted

Reference request: functoriality of $\underline{E}$ and $\underline{B}$

answered Aug 20, 2021 at 14:36

2 votes

Element being trivial in a finitely presented group independent of ZFC

answered Apr 21, 2021 at 19:15

2 votes

Geometric intuition behind Garside's paper?

answered May 14, 2021 at 13:01

1 vote

Which groups have undetectable third U(1)-cohomology?

answered Jan 29, 2021 at 12:37

1 vote

Basic operation geometrical meaning

answered Jan 28, 2020 at 15:04

1 vote

Modifying Dehn's algorithm to allow equal length replacements?

answered Jan 28, 2020 at 15:20

1 vote

Which graphs are Cayley graphs?

answered Mar 22, 2019 at 15:30

1 vote

Simple examples for the use of spectral sequences

answered Apr 5, 2019 at 13:42

1 vote

On the group homology

answered Jun 5, 2018 at 10:40

0 votes

How can I construct a closed manifold from a finite CW complex?

answered Aug 20, 2021 at 15:00

0 votes

Topology of a union of facets of a convex polytope

answered Dec 30, 2022 at 15:47

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60 Answers

Are geodesics necessarily embedded?

Defining the classifying space of a group acting on a set

About Čech cohomology in transformation groups

Higher cohomology for trivial module for finite groups of Lie type

Cellular homology of the universal cover

Decidability of word problem for group admitting certain action

Dimension of classifying space of a group

Groups acting on products of hyperbolic spaces

An acyclic simplicial complex where all links are generalised homology spheres

Construction of representations of the Mathieu groups?

What is the minimal dimension of a complex realising a group representation?

Cohomological variety in case that Sylow subgroup is elementary abelian

Automorphism group of a normal tiling of the plane

Special cell decomposition for spheres with free $\mathbb{Z}/p\mathbb{Z}$-action by orthogonal transformations?

Kan–Thurston theorem and R-completion

Transgression image and Serre spectral sequence for tori

A question about Wall's construction for CW-complexes

Homotopy type of non-Cohen-Macaulay complexes

Is the cohomology ring $H^*(BG,\mathbb{Z})$ generated by Euler classes?

Reference request: functoriality of $\underline{E}$ and $\underline{B}$

Element being trivial in a finitely presented group independent of ZFC

Geometric intuition behind Garside's paper?

Which groups have undetectable third U(1)-cohomology?

Basic operation geometrical meaning

Modifying Dehn's algorithm to allow equal length replacements?

Which graphs are Cayley graphs?

Simple examples for the use of spectral sequences

On the group homology

How can I construct a closed manifold from a finite CW complex?

Topology of a union of facets of a convex polytope