Association schemes and orthogonality graphs on anisotropic points of
polar spaces
Association schemes and orthogonality graphs on anisotropic points of
polar spaces
In this paper, we study association schemes on the anisotropic points of classical polar spaces. Our main result concerns non-degenerate elliptic and hyperbolic quadrics in PG$(n,q)$ with $q$ odd. We define relations on the anisotropic points of such a quadric that depend on the type of line spanned by the …