2022
DOI: 10.48550/arxiv.2208.03787
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Centralisers of finite groups in locally finite simple groups

David J. Benson

Abstract: We answer in the negative a question of Hartley about representations of finite groups, by constructing examples of finite simple groups with arbitrarily large representations whose endomorphism ring consists of just the scalars. We show as a consequence that there are finite simple groups of automorphisms of the locally finite simple group SL(∞, F q ) with trivial centraliser. The smallest of our examples is A 6 with q = 9.

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