proposition: Lemma ismodulefun_pr1 {R : ring} {M : module R} (A : submodule M) : @ismodulefun R A M pr1.
proof: Proof. use make_ismodulefun. exact (pr1 (ismonoidfun_pr1 A)). intros r a. reflexivity. Defined.
imports: UniMath.MoreFoundations.Subtypes UniMath.Algebra.RigsAndRings UniMath.Algebra.Monoids UniMath.Algebra.Groups UniMath.Algebra.Modules.Core