proposition: Lemma is_nat_trans_η {C : category} (T : KleisliMonad C) : is_nat_trans (functor_identity C) (kleisli_functor T) (η T).
proof: Proof. unfold is_nat_trans. simpl. intros. now rewrite (map_η T). Defined.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.MoreFoundations.Tactics UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.FunctorCategory UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.whiskering UniMath.CategoryTheory.Monads.Monads UniMath.CategoryTheory.Monads.RelativeMonads