Lemma lunitor_V_id_is_left_unit_V_id (X : C) : linvunitor (id₁ X) = rinvunitor (id₁ X). Proof. use inv_cell_eq. - is_iso. - is_iso. - cbn. apply lunitor_runitor_identity. 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.