讲座内容：

A graph is half-arc-transitive if its full automorphism group acts transitively on its vertex set and edge set, but not arc set. A graph is said to be a bi-Cayley graph over a group H if it admits H as a semiregular automorphism group with two vertex-orbits. In this talk, I will introduce some results about half-arc-transitive bi-Cayley graphs.