{R : Ring} {M N : LeftModule R} : lm_prod M N $-> N. Proof. snrapply Build_LeftModuleHomomorphism. - apply grp_prod_pr2. - reflexivity. Defined.
Require Import WildCat. Require Import Spaces.Nat.Core. Require Import Classes.interfaces.canonical_names. Require Import Algebra.Groups.Kernel Algebra.Groups.Image Algebra.Groups.QuotientGroup. Require Import Algebra.AbGroups.AbelianGroup Algebra.AbGroups.Biproduct. Require Import Rings.Ring.