fact: Definition module_kernel_eq {R : ring} {A B : module R} (f : modulefun A B) x : f (submodule_incl (module_kernel f) x) = unel B := (pr2 x).
imports: UniMath.MoreFoundations.Subtypes UniMath.Algebra.RigsAndRings UniMath.Algebra.Monoids UniMath.Algebra.Groups UniMath.Algebra.Modules.Core