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