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