proposition: 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: Proof. symmetry. apply rwhisker_rwhisker. Qed.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.Bicategories.Core.Bicat UniMath.Bicategories.Core.Invertible_2cells UniMath.Bicategories.Core.Unitors