Abstract

Given a permutation group G, the derangement graph ΓG of G is the Cayley graph with connection set the set of all derangements of G. We prove that, when G is transitive of degree at least 3, ΓG contains a triangle.The motivation for this work is the question of how large can be the ratio of the independence number of ΓG to the size of the stabilizer of a point in G. We give examples of transitive groups where this ratio is maximum.

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