proposition: Lemma modulehombinop_assoc {R : ring} {M N : module R} (f g h : R-mod(M, N)) : modulehombinop (modulehombinop f g) h = modulehombinop f (modulehombinop g h).
proof: Proof. use modulefun_paths2. intros x. use assocax. Qed.
imports: UniMath.MoreFoundations.Tactics UniMath.Algebra.RigsAndRings UniMath.Algebra.Groups UniMath.Algebra.Monoids