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Irreducible almost simple subgroups of classical algebraic groups

About this Title

Timothy C. Burness, School of Mathematics, University of Bristol, Bristol, BS8 1TW, United Kingdom, Soumaïa Ghandour, Faculté des Sciences, Section V, Université Libanaise, Nabatieh, Lebanon, Claude Marion, Section de Mathématiques, Station 8, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland and Donna M. Testerman, Section de Mathématiques, Station 8, École Polytechnique Fédér-, ale de Lausanne, CH-1015 Lausanne, Switzerland

Publication: Memoirs of the American Mathematical Society
Publication Year: 2015; Volume 236, Number 1114
ISBNs: 978-1-4704-1046-9 (print); 978-1-4704-2280-6 (online)
DOI: https://doi.org/10.1090/memo/1114
Published electronically: December 16, 2014
Keywords: Classical algebraic group; disconnected maximal subgroup; irreducible triple
MSC: Primary 20G05; Secondary 20E28, 20E32

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Table of Contents

Chapters

  • 1. Introduction
  • 2. Preliminaries
  • 3. The case $H^0 = A_m$
  • 4. The case $H^0=D_m$, $m \ge 5$
  • 5. The case $H^0=E_6$
  • 6. The case $H^0 = D_4$
  • 7. Proof of Theorem
  • Notation

Abstract

Let $G$ be a simple classical algebraic group over an algebraically closed field $K$ of characteristic $p\geq 0$ with natural module $W$. Let $H$ be a closed subgroup of $G$ and let $V$ be a nontrivial $p$-restricted irreducible tensor indecomposable rational $KG$-module such that the restriction of $V$ to $H$ is irreducible. In this paper we classify the triples $(G,H,V)$ of this form, where $V \neq W,W^{*}$ and $H$ is a disconnected almost simple positive-dimensional closed subgroup of $G$ acting irreducibly on $W$. Moreover, by combining this result with earlier work, we complete the classification of the irreducible triples $(G,H,V)$ where $G$ is a simple algebraic group over $K$, and $H$ is a maximal closed subgroup of positive dimension.

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