On imprimitive rank 3 permutation groups

Details On imprimitive rank 3 permutation groups On imprimitive rank 3 permutation groups

2010-03-11

arxiv.org/abs/1003.2272v2

J. London Math. Soc. (2011) 84 (3): 649-669, Erratum: J. London Math. Soc. (2012) doi: 10.1112/jlms/jdr074

Mathematics

Group Theory

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Scientific paper

A classification is given of rank 3 group actions which are quasiprimitive but not primitive. There are two infinite families and a finite number of individual imprimitive examples. When combined with earlier work of Bannai, Kantor, Liebler, Liebeck and Saxl, this yields a classification of all quasiprimitive rank 3 permutation groups. Our classification is achieved by first classifying imprimitive almost simple permutation groups which induce a 2-transitive action on a block system and for which a block stabiliser acts 2-transitively on the block. We also determine those imprimitive rank 3 permutation groups $G$ such that the induced action on a block is almost simple and $G$ does not contain the full socle of the natural wreath product in which $G$ embeds.

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