proposition: Lemma is_nat_trans_μ {C : category} (T : KleisliMonad C) : is_nat_trans (kleisli_functor T ∙ kleisli_functor T) (kleisli_functor T) (μ T).
proof: Proof. unfold is_nat_trans, μ. simpl. intros. rewrite (map_bind T), (bind_map T). now rewrite id_left, id_right. 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