Lemma is_invertible_2cell_linvunitor {a b : C} (f : C ⟦ a, b ⟧) : is_invertible_2cell (linvunitor f). Proof. exists (lunitor f). abstract (apply (linvunitor_lunitor _ ,, lunitor_linvunitor _)). Defined.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Isos. Require Import UniMath.CategoryTheory.Core.Functors. Require Import UniMath.CategoryTheory.Core.NaturalTransformations. Require Import UniMath.CategoryTheory.PrecategoryBinProduct.