Unipotent And Nilpotent Classes In Simple Algebraic Groups And Lie Algebras
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Unipotent and Nilpotent Classes in Simple Algebraic Groups and Lie Algebras
Author: Martin W. Liebeck
language: en
Publisher: American Mathematical Soc.
Release Date: 2012-01-25
This book concerns the theory of unipotent elements in simple algebraic groups over algebraically closed or finite fields, and nilpotent elements in the corresponding simple Lie algebras. These topics have been an important area of study for decades, with applications to representation theory, character theory, the subgroup structure of algebraic groups and finite groups, and the classification of the finite simple groups. The main focus is on obtaining full information on class representatives and centralizers of unipotent and nilpotent elements. Although there is a substantial literature on this topic, this book is the first single source where such information is presented completely in all characteristics. In addition, many of the results are new--for example, those concerning centralizers of nilpotent elements in small characteristics. Indeed, the whole approach, while using some ideas from the literature, is novel, and yields many new general and specific facts concerning the structure and embeddings of centralizers.
Centres of Centralizers of Unipotent Elements in Simple Algebraic Groups
Let G be a simple algebraic group defined over an algebraically closed field k whose characteristic is either 0 or a good prime for G, and let uEG be unipotent. The authors study the centralizer CG(u), especially its centre Z(CG(u)). They calculate the Lie algebra of Z(CG(u)), in particular determining its dimension; they prove a succession of theorems of increasing generality, the last of which provides a formula for dim Z(CG(u)) in terms of the labelled diagram associated to the conjugacy class containing u.
Generic Stabilizers in Actions of Simple Algebraic Groups
Author: R. M. Guralnick
language: en
Publisher: American Mathematical Society
Release Date: 2024-09-09
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