Lemma triangle_l_inv {X Y Z : C} (g : C⟦Y,Z⟧) (f : C⟦X,Y⟧) : lassociator f (id₁ Y) g o linvunitor g ⋆⋆ id₂ f = id₂ g ⋆⋆ rinvunitor f. Proof. use inv_cell_eq. - is_iso. - is_iso. - cbn. apply triangle_l. 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.