Highly Influenced

@article{Graham1985ArrangementsIU, title={Arrangements in Unitary and Orthogonal Geometry over Finite Fields}, author={Ronald L. Graham and Louis Solomon}, journal={J. Comb. Theory, Ser. A}, year={1985}, volume={38}, pages={217-229} }

- Published 1985 in J. Comb. Theory, Ser. A
DOI:10.1016/0097-3165(85)90072-X

Let V be an n-dimensional vector space over F,. Let @ be a Hermitian form with respect to an automorphism u with u2 = 1. If u = 1 assume that q is odd. Let I be the arrangement of hyperplanes of V which are non-isotropic with respect to Cp, and let L be the intersection lattice of d. We prove that the characteristic polynomial of L has n v roots 1, q,.... qnmv-’ where v is the Witt index of @. (