proposition: 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: Proof. symmetry. apply lunitor_triangle. 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