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Finite quasiprimitive graphs. (English) Zbl 0881.05055
Bailey, R. A. (ed.), Surveys in combinatorics, 1997. Proceedings of the 16th British combinatorial conference, London, UK, July 1997. London: Cambridge University Press. Lond. Math. Soc. Lect. Note Ser. 241, 65-85 (1997).
The paper is a survey of results on quasiprimitive groups and finite arc-transitive graphs with vertex-quasiprimitive automorphism groups. The concept of a quasiprimitive group action is a generalization of the one of a primitive action, and a permutation group on a set $$\Omega$$ is said to be quasiprimitive if all its non-trivial normal subgroups are transitive on $$\Omega$$. The author successfully argues the importance of the study of quasiprimitive graphs for a better understanding of several classes of arc-transitive graphs; the claim is supported by a series of examples. An O’Nan-Scott type classification of quasiprimitive groups is presented and applied to the class of finite quasiprimitive 2-arc transitive vertex-transitive graphs. A discussion of the full automorphism groups of quasiprimitive graphs concludes the paper that includes an extensive list of open problems.
For the entire collection see [Zbl 0869.00029].

##### MSC:
 05C25 Graphs and abstract algebra (groups, rings, fields, etc.)