English

Modules induced from a normal subgroup of prime index

Representation Theory 2021-01-19 v1

Abstract

Let GG be a finite group and HH a normal subgroup of prime index pp. Let VV be an irreducible FH{\mathbb F}H-module and UU a quotient of the induced FG{\mathbb F}G-module VV\kern-3pt\uparrow. We describe the structure of UU, which is semisimple when char(F)p{\rm char}({\mathbb F})\ne p and uniserial if char(F)=p{\rm char}({\mathbb F})=p. Furthermore, we describe the division rings arising as endomorphism algebras of the simple components of UU. We use techniques from noncommutative ring theory to study EndFG(V){\rm End}_{{\mathbb F}G}(V\kern-3pt\uparrow) and relate the right ideal structure of EndFG(V){\rm End}_{{\mathbb F}G}(V\kern-3pt\uparrow) to the submodule structure of VV\kern-3pt\uparrow.

Keywords

Cite

@article{arxiv.2101.06604,
  title  = {Modules induced from a normal subgroup of prime index},
  author = {S. P. Glasby},
  journal= {arXiv preprint arXiv:2101.06604},
  year   = {2021}
}

Comments

15 pages. This paper from 2004 is not on the arXiv

R2 v1 2026-06-23T22:14:18.629Z