One-matching bi-Cayley graphs over abelian groups
A bi-Cayley graph is a graph which admits a semiregular group of automorphisms with two orbits (of equal size), and is a one-matching bi-Cayley graph if the bipartite graph induced by the edges joining these two orbits is a perfect matching. Typical examples of such graphs are the generalized Petersen graphs. A classification of connected arc-transitive one-matching bi-Cayley graphs over abelian groups is given. This is done without referring to the classification of finite simple groups. Instead, complex irreducible characters of abelian groups are used extensively.