proposition: Fact comp_is_top_morphism : (f \o g) \top = \top.
proof: Proof. by rewrite /= !omorph1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)