proposition: Lemma left_unit_inv_assoc {X Y Z : C} (g : C⟦Y,Z⟧) (f : C⟦X,Y⟧) : (rinvunitor g) ▻ f = rassociator _ _ _ o rinvunitor (g ∘ f).
proof: Proof. rewrite <- rinvunitor_triangle. rewrite <- vassocr. rewrite lassociator_rassociator. rewrite id2_right. apply idpath. 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