A Class of Bipartite 2-Path-Transitive Graphs

A graph Γ is called half-arc-transitive if it's automorphism group Aut Γ is transitive on the vertex set and edge set, but not on the arc set of the graph Γ, and it is called 2-path-transitive if Aut Γ is transitive on the set of the 2-paths. In this paper we construct a class of 2-path-transitive graphs from some symmetric groups, based on which a new class of half-arc-transitive graphs is given.