On tetravalent symmetric dihedrants

摘要

Let Γ be a tetravalent X-arc-transitive Cayley graph of dihedral group for X ≤ AutΓ. Let Xv be the stabilizer of X on v ∈ VΓ. Γ has been determined when it is 2-arc-transitive or one-regular. This paper studies the case where Γ is one-transitive but not one-regular, and gives it an exactly characterization. As an application of this result, we give a compete classification of such graphs when |Xv| ≤ 24. By production, a compete classification is given for the stabilizers of tetravalent symmetric Cayley graphs whenever its order is less than 25.