proposition: Fact anti : antisymmetric (leq : rel bool).
proof: Proof. by move=> x y /anti_leq /(congr1 odd); rewrite !oddb. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)