Heptavalent symmetric graphs with solvable stabilizers admitting vertex-transitive non-abelian simple groups

Abstract

A graph $\Gamma$ is said to be symmetric if its automorphism group $\mathrm{Aut}(\mathrm{\Gamma })$ acts transitively on the arc set of $\Gamma$. In this paper, we show that if $\Gamma$ is a finite connected heptavalent symmetric graph with solvable stabilizer admitting a vertex-transitive non-abelian simple group $G$ of automorphisms, then either $G$ is normal in $\mathrm{Aut}(\mathrm{\Gamma })$, or $\mathrm{Aut}(\mathrm{\Gamma })$ contains a non-abelian simple normal subgroup $T$ such that $G\le T$ and $(G,T)$ is explicitly given as one of $11$ possible exception pairs of non-abelian simple groups. Furthermore, if $G$ is regular on the vertex set of $\Gamma$ then the exception pair $(G,T)$ is one of $7$ possible pairs, and if $G$ is arc-transitive then the exception pair $(G,T)=(A_{17},A_{18})$ or $(A_{35},A_{36})$.

9. arXiv admin note: substantial text overlap with arXiv:1701.01187