Elementary abelian subgroups: From algebraic groups to finite groups

Jianbei An, Heiko Dietrich, Alastair Litterick

Research output: Contribution to journalArticleResearchpeer-review

Abstract

We describe a new approach for classifying conjugacy classes of elementary abelian subgroups in simple algebraic groups over an algebraically closed field, and understanding the normaliser and centraliser structure of these. For toral subgroups, we give an effective classification algorithm. For non-toral elementary abelian subgroups, we focus on algebraic groups of exceptional type with a view to future applications, and in this case we provide tables explicitly describing the subgroups and their local structure. We then describe how to transfer results to the corresponding finite groups of Lie type using the Lang-Steinberg Theorem; this will be used in forthcoming work to complete the classification of elementary abelian p-subgroups for torsion primes p in finite groups of exceptional Lie type. Such classification results are important for determining the maximal p-local subgroups and p-radical subgroups, both of which play a crucial role in modular representation theory.
Original languageEnglish
Pages (from-to)8335-8380
Number of pages43
JournalTransactions of the American Mathematical Society
Volume377
Issue number12
DOIs
Publication statusPublished - 20 Sept 2024

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