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