A class of symmetric graphs with 2-arc-transitive quotients

Bin Jia, Zaiping Lu, Gaixia Wang

Let $\Gamma$ be a finite X-symmetric graph with a nontrivial X-invariant partition $\mathcal{B}$ on $V(\Gamma )$ such that ${\Gamma }_{\mathcal{B}}$ is a connected (X,2)-arc-transitive graph and $Γ…