fact: Definition relmodule_mor_id (M : RelModule R) : RelModule_Mor M M := ((λ a, identity (M a)),, is_relmodule_mor_id M).
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Monads.RelativeMonads