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MAXIMAL SUBGROUPS OF LARGE RANK IN EXCEPTIONAL GROUPS OF LIE TYPE

Published online by Cambridge University Press:  06 April 2005

MARTIN W. LIEBECK
Affiliation:
Department of Mathematics, Imperial College, London SW7 2BZ, United Kingdom
GARY M. SEITZ
Affiliation:
Department of Mathematics, University of Oregon, Eugene, OR 97403, USA
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Abstract

Let $G=G(q)$ be a finite almost simple exceptional group of Lie type over the field of $q$ elements, where $q=p^a$ and $p$ is prime. The main result of the paper determines all maximal subgroups $M$ of $G(q)$ such that $M$ is an almost simple group which is also of Lie type in characteristic $p$, under the condition that ${\rm rank}(M) > {1\over 2}{\rm rank}(G)$. The conclusion is that either $M$ is a subgroup of maximal rank, or it is of the same type as $G$ over a subfield of $\F_q$, or $(G,M)$ is one of $(E_6^\e(q),F_4(q))$, $(E_6^\e(q),C_4(q))$, $(E_7(q),\,^3\!D_4(q))$. This completes work of the first author with Saxl and Testerman, in which the same conclusion was obtained under some extra assumptions.

Keywords

Type
Notes and Papers
Copyright
The London Mathematical Society 2005

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