Lemma whisker_l_hcomp {W X Y Z : C} {f : C⟦X,Y⟧} {g : C⟦Y,Z⟧} (k₁ k₂ : C⟦W,X⟧) (α : k₁ ==> k₂) : lassociator _ _ _ o (g ∘ f ◅ α) = g ◅ (f ◅ α) o lassociator _ _ _. Proof. symmetry. apply rwhisker_rwhisker. 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.