List questions from group-rings

Published on 14 Apr 2026 - 3:07

63

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Hom$_{i[k]}(k[G], R) \approx$ Hom$(G,R^*)$

Published on 16 Apr 2026 - 15:01

115

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Find an example of a group algebra with non-trivial solutions to $x^2=x$.

Published on 16 Apr 2026 - 9:55

135

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A question about group ring of a group over matrix ring!

Published on 11 Apr 2026 - 14:38

285

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How do I construct the group algebra of a group in GAP?

Published on 11 Apr 2026 - 11:28

95

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Confused about the $K$-algebra homomorphism from a representation

Published on 11 Apr 2026 - 13:49

365

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Group Rings of Topological Groups and Fields

Published on 10 May 2026 - 11:20

49

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What is the differential $d^0(f) : C^0(G, A) \to C^1(G, A)$ knowing the general formula?

Published on 15 Apr 2026 - 23:40

46

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The maps in the $\mathbb Z [\mathbb Z]-$free resolution of $\mathbb Z$

Published on 10 Apr 2026 - 9:56

487

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Tensor product of group algebras

Published on 13 Apr 2026 - 13:07

336

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Representation of group ring $R[G]$

Published on 13 Apr 2026 - 16:15

39

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Cycle detection using group ring membership.

Published on 12 Apr 2026 - 6:28

186

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Group ring of $\mathbb Z\times \mathbb Z$.

Published on 09 Apr 2026 - 11:03

137

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Free resolution of $\mathbb Z\times \mathbb Z$.

Published on 10 Apr 2026 - 13:18

537

Views

Are there homomorphisms of group algebras that don't come from a group homomorphism?

Published on 11 Apr 2026 - 19:21

List Question

GAP: how to work with elements of the group ring of the symmetric group $\mathbb{C}[S_k]$?

Hom$_{i[k]}(k[G], R) \approx$ Hom$(G,R^*)$

Find an example of a group algebra with non-trivial solutions to $x^2=x$.

A question about group ring of a group over matrix ring!

How do I construct the group algebra of a group in GAP?

Confused about the $K$-algebra homomorphism from a representation

Group Rings of Topological Groups and Fields

What is the differential $d^0(f) : C^0(G, A) \to C^1(G, A)$ knowing the general formula?

The maps in the $\mathbb Z [\mathbb Z]-$free resolution of $\mathbb Z$

Tensor product of group algebras

Representation of group ring $R[G]$

Cycle detection using group ring membership.

Group ring of $\mathbb Z\times \mathbb Z$.

Free resolution of $\mathbb Z\times \mathbb Z$.

Are there homomorphisms of group algebras that don't come from a group homomorphism?

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