Lemma lunitor_assoc {X Y Z : C} (g : C⟦Y,Z⟧) (f : C⟦X,Y⟧) : lunitor (g ∘ f) = g ◅ (lunitor f) o lassociator (id₁ X) f g. Proof. symmetry. apply lunitor_triangle. Qed.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.Bicategories.Core.Bicat. Import Bicat.Notations. Require Import UniMath.Bicategories.Core.Invertible_2cells. Require Import UniMath.Bicategories.Core.Unitors.