Question

Element of group ring not invertible, but invertible in bigger group ring.

score 94 · Answer 1 · 2026-04-14 13:24:50

94

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Element of group ring not invertible, but invertible in bigger group ring.

Published on 14 Apr 2026 - 13:24

score 16 · Answer 2 · 2026-04-12 10:44:15

16

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Is problem of finiteness in the sense of von Neumann field FG algebras solved for any class of groups?

Published on 12 Apr 2026 - 10:44

score 70 · Answer 3 · 2026-03-25 14:22:38

70

Views

On structure of the Iwasawa algebra

Published on 25 Mar 2026 - 14:22

score 55 · Answer 4 · 2026-05-10 13:22:44

55

Views

Prime ideals in group ring

Published on 10 May 2026 - 13:22

score 77 · Answer 5 · 2026-05-10 18:58:58

77

Views

Looking for a good name for this "Quantisation Regime"

Published on 10 May 2026 - 18:58

score 143 · Answer 6 · 2026-04-11 05:36:05

143

Views

submodules of a group algebra

Published on 11 Apr 2026 - 5:36

score 50 · Answer 7 · 2026-04-18 06:49:16

50

Views

$(\mathbb{F}_p\times\mathbb{F}_p)[F_n]\cong\mathbb{F}_p[F_n]\times\mathbb{F}_p[F_n]$ where $p$ is prime and $F_n$ is the free group of rank $n$.

Published on 18 Apr 2026 - 6:49

score 60 · Answer 8 · 2026-04-13 18:25:30

60

Views

What is $\mathbb{Q}[\mathbf{Z}/n\mathbf{Z}]$?

Published on 13 Apr 2026 - 18:25

score 421 · Answer 9 · 2026-04-12 22:34:40

421

Views

Canonical homomorphism from a group ring to its subring.

Published on 12 Apr 2026 - 22:34

score 103 · Answer 10 · 2026-04-12 07:24:30

103

Views

Some results about Group Rings/Algebras

Published on 12 Apr 2026 - 7:24

score 583 · Answer 11 · 2026-04-17 08:56:50

583

Views

Computing the Jacobson radical of $F[G]$ with $char(F)=p$ and $G$ finite with a normal $p$-Sylow subgroup

Published on 17 Apr 2026 - 8:56

score 51 · Answer 12 · 2026-04-17 12:11:15

51

Views

Decomposing $\mathbb{F}_p[G]$ ($G$ finite) into products of matrix rings over fields

Published on 17 Apr 2026 - 12:11

score 229 · Answer 13 · 2026-04-13 13:37:59

229

Views

General form of Maschke's Theorem for $R[G]$

Published on 13 Apr 2026 - 13:37

score 607 · Answer 14 · 2026-04-14 05:35:04

607

Views

Isomorphism Of Quotient rings

Published on 14 Apr 2026 - 5:35

score 467 · Answer 15 · 2026-04-09 13:56:27

467

Views

If $k$ is a field of characteristic $p>0$ and $G$ is a finite group of order divisible by $p$ then $k[G]$ is not a semi-simple ring.

Published on 09 Apr 2026 - 13:56

List Question

Element of group ring not invertible, but invertible in bigger group ring.

Is problem of finiteness in the sense of von Neumann field FG algebras solved for any class of groups?

On structure of the Iwasawa algebra

Prime ideals in group ring

Looking for a good name for this "Quantisation Regime"

submodules of a group algebra

$(\mathbb{F}_p\times\mathbb{F}_p)[F_n]\cong\mathbb{F}_p[F_n]\times\mathbb{F}_p[F_n]$ where $p$ is prime and $F_n$ is the free group of rank $n$.

What is $\mathbb{Q}[\mathbf{Z}/n\mathbf{Z}]$?

Canonical homomorphism from a group ring to its subring.

Some results about Group Rings/Algebras

Computing the Jacobson radical of $F[G]$ with $char(F)=p$ and $G$ finite with a normal $p$-Sylow subgroup

Decomposing $\mathbb{F}_p[G]$ ($G$ finite) into products of matrix rings over fields

General form of Maschke's Theorem for $R[G]$

Isomorphism Of Quotient rings

If $k$ is a field of characteristic $p>0$ and $G$ is a finite group of order divisible by $p$ then $k[G]$ is not a semi-simple ring.

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