proposition: Fact comp_is_order_morphism : order_morphism (f \o g).
proof: Proof. by move=> x y; rewrite /= !omorph_le. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)