Abstract
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. A bi-dihedrant is a bi-Cayley graph over a dihedral group. In this paper, it is shown that every connected trivalent edge-transitive bi-dihedrant is also vertex-transitive, and then we present a classification of trivalent arc-transitive bi-dihedrants, and study the Cayley property of trivalent vertex-transitive bi-dihedrants.
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