Orthogonal graphs of odd characteristic and their automorphisms

摘要

The (isotropic) orthogonal graph O(2v + δ, q) over F_q of odd characteristic, where v ≥ 1 and δ = 0,1 or 2 is introduced. When v = 1, O(2 · 1 + δ, q) is a complete graph. When v ≥ 2, O(2v + δ, q) is strongly regular and its parameters are computed, as wel