2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/100226We study the Z/2-equivariant K-theory of the complement of the complexification of a real hyperplane arrangement. We compute the rational K and KO rings, and give two different combinatorial descriptions of the subring of the integral KO ring generated by line bundles.11 pages, no figures; final version, to appear in Topology and its ApplicationsCombinatoricsK-Theory and Homology52C35text