List questions from group-cohomology

Published on 28 Jun 2020 - 7:22

304

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Proof of Profinite groups are inverse limits of finite groups

Published on 25 Mar 2026 - 9:28

186

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Proving that uniquely divisible torsion group is trivial in case of $H^r _{cts}(G,\mathbb Q)$

Published on 25 Mar 2026 - 9:29

189

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A finite group with a non trivial 3 cocycle that is trivial on any cyclic subgroup.

Published on 08 Jul 2020 - 12:47

366

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Why $\mathrm{Restriction}\circ \mathrm{Corestriction}$ is multiplication on cohomology?

Published on 09 Jul 2020 - 15:49

102

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Group Ring and Augmentation Ideal of Baumslag Solitar Groups

Published on 13 Jul 2020 - 22:32

681

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Long Exact Sequence in Group Cohomology Proof

Published on 14 Jul 2020 - 1:49

47

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Why is hypothesis of Tate's theorem is satisfied by Galois group of unramified extension of a local field?

Published on 26 Mar 2026 - 16:10

324

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Extensions of $\mathbb{Z_3}$ by $\mathbb{Z_9}$

Published on 14 Jul 2020 - 22:23

191

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$G$-modules, Group invariants and Tor functor

Published on 25 Mar 2026 - 17:18

177

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Second cohomology group of an affine Lie algebra

Published on 18 Jul 2020 - 22:16

74

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Understanding the $\alpha$ existence in the definition of the boundary map in case of simplicial homology and its absence in singular homology.

Published on 22 Jul 2020 - 22:27

132

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Action of the Fundamental Group of Klein Bottle over $\mathbb{R}^{2}$

Published on 23 Jul 2020 - 19:57

185

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Skew-symmetric bicharacters on $A$ and $H^2(A,\mathbb{C}^{\times})$

Published on 24 Jul 2020 - 8:43

181

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Undertstanding Cup products

Published on 26 Mar 2026 - 17:43

List Question

Definition of Crossed homomorphism

Proof of Profinite groups are inverse limits of finite groups

Proving that uniquely divisible torsion group is trivial in case of $H^r _{cts}(G,\mathbb Q)$

A finite group with a non trivial 3 cocycle that is trivial on any cyclic subgroup.

Why $\mathrm{Restriction}\circ \mathrm{Corestriction}$ is multiplication on cohomology?

Group Ring and Augmentation Ideal of Baumslag Solitar Groups

Long Exact Sequence in Group Cohomology Proof

Why is hypothesis of Tate's theorem is satisfied by Galois group of unramified extension of a local field?

Extensions of $\mathbb{Z_3}$ by $\mathbb{Z_9}$

$G$-modules, Group invariants and Tor functor

Second cohomology group of an affine Lie algebra

Understanding the $\alpha$ existence in the definition of the boundary map in case of simplicial homology and its absence in singular homology.

Action of the Fundamental Group of Klein Bottle over $\mathbb{R}^{2}$

Skew-symmetric bicharacters on $A$ and $H^2(A,\mathbb{C}^{\times})$

Undertstanding Cup products

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