Abstract

Abstract A picture is a simple graph together with an edge-coloring, such that each vertex is incident with exactly one edge of each color. An automorphism of a picture is a graph automorphism that preserves the colors of the edges. We show that every group is isomorphic to the full automorphism group of a picture, and prove that a group is isomorphic to a vertex-transitive subgroup of the automorphism group of a picture if and only if it can be generated by involutions.

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