List questions from group-cohomology

156

Views

On understanding $\mathrm{ad}^0 \overline{\rho}$ and $\mathrm{ad}^0 \overline{\rho}(1)$ in Taylor-Wiles method

Published on 26 Mar 2026 - 9:49

571

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Understanding naturality of cup product definition.

Published on 27 Mar 2026 - 19:15

186

Views

$\tilde{H}_n(X \cup CA) \simeq H_n(X,A)$

Published on 21 Mar 2021 - 7:24

83

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Correspondences between nonabelian cohomology classes

Published on 27 Mar 2026 - 14:21

110

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Proof of Inflation-Restriction Exact Sequence by Spectral Sequence

Published on 11 Apr 2021 - 12:11

108

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Explicit extensions of $\mathbb{Z}/m$ by $\mathbb{Z}/n$

Published on 12 Apr 2021 - 16:21

195

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Base change of $H^n(\Gamma, \mathrm{Sym}^{k}(R^2))$ - A small step in Eichler-Shimura

Published on 14 Apr 2021 - 4:35

167

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Clarification about $C \otimes D$ with $C,D$ contractible chain complex

Published on 17 Apr 2021 - 19:40

80

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If $A$ is abelian, then $Ext(G,A)\cong H^2(G,A).$

Published on 22 Apr 2021 - 17:04

57

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Cohomology of finite cyclic group vanishes everywhere if it vanishes somewhere

Published on 27 Apr 2021 - 16:08

29

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Historical reference to the group cohomology of the integers mod 4

Published on 04 May 2021 - 6:00

63

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A counterexample for a Theorem of Hirsch on the Cohomology of a nilpotent group over a finite dimensional vector space

Published on 05 May 2021 - 22:10

441

Views

Sign in definition of Cap product

Published on 06 May 2021 - 10:19

136

Views

Group cohomology as cohomology of a K(G,1) CW-complex

Published on 26 Mar 2026 - 12:37

38

Views

Left derived functor of cohomology groups

Published on 27 Mar 2026 - 10:09

List Question

On understanding $\mathrm{ad}^0 \overline{\rho}$ and $\mathrm{ad}^0 \overline{\rho}(1)$ in Taylor-Wiles method

Understanding naturality of cup product definition.

$\tilde{H}_n(X \cup CA) \simeq H_n(X,A)$

Correspondences between nonabelian cohomology classes

Proof of Inflation-Restriction Exact Sequence by Spectral Sequence

Explicit extensions of $\mathbb{Z}/m$ by $\mathbb{Z}/n$

Base change of $H^n(\Gamma, \mathrm{Sym}^{k}(R^2))$ - A small step in Eichler-Shimura

Clarification about $C \otimes D$ with $C,D$ contractible chain complex

If $A$ is abelian, then $Ext(G,A)\cong H^2(G,A).$

Cohomology of finite cyclic group vanishes everywhere if it vanishes somewhere

Historical reference to the group cohomology of the integers mod 4

A counterexample for a Theorem of Hirsch on the Cohomology of a nilpotent group over a finite dimensional vector space

Sign in definition of Cap product

Group cohomology as cohomology of a K(G,1) CW-complex

Left derived functor of cohomology groups

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