proposition: Lemma ge_max z x y : (max x y <= z) = (x <= z) && (y <= z).
proof: Proof. exact: comparable_ge_max. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)