Question

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

score 91 · Answer 1 · 2020-06-20 11:58:53

91

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

Published on 20 Jun 2020 - 11:58

score 14 · Answer 2 · 2026-03-03 05:22:31

14

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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 03 Mar 2026 - 5:22

score 69 · Answer 3 · 2020-06-28 15:12:39

69

Views

On structure of the Iwasawa algebra

Published on 28 Jun 2020 - 15:12

score 51 · Answer 4 · 2020-07-16 14:27:49

51

Views

Prime ideals in group ring

Published on 16 Jul 2020 - 14:27

score 73 · Answer 5 · 2016-08-16 13:22:42

73

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Looking for a good name for this "Quantisation Regime"

Published on 16 Aug 2016 - 13:22

score 140 · Answer 6 · 2016-08-16 16:47:39

140

Views

submodules of a group algebra

Published on 16 Aug 2016 - 16:47

score 47 · Answer 7 · 2016-09-01 15:37:18

47

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 01 Sep 2016 - 15:37

score 57 · Answer 8 · 2016-09-09 02:16:06

57

Views

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

Published on 09 Sep 2016 - 2:16

score 418 · Answer 9 · 2016-11-09 14:52:50

418

Views

Canonical homomorphism from a group ring to its subring.

Published on 09 Nov 2016 - 14:52

score 100 · Answer 10 · 2016-11-21 22:17:37

100

Views

Some results about Group Rings/Algebras

Published on 21 Nov 2016 - 22:17

score 580 · Answer 11 · 2016-12-08 14:00:07

580

Views

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

Published on 08 Dec 2016 - 14:00

score 48 · Answer 12 · 2026-02-23 04:02:32

48

Views

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

Published on 23 Feb 2026 - 4:02

score 226 · Answer 13 · 2026-02-23 04:01:44

226

Views

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

Published on 23 Feb 2026 - 4:01

score 604 · Answer 14 · 2017-01-01 13:56:42

604

Views

Isomorphism Of Quotient rings

Published on 01 Jan 2017 - 13:56

score 465 · Answer 15 · 2026-02-23 05:47:17

465

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 23 Feb 2026 - 5:47

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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