Lemma is_invertible_2cell_runitor {a b : C} (f : C ⟦ a, b ⟧) : is_invertible_2cell (runitor f). Proof. exists (rinvunitor f). abstract (apply (runitor_rinvunitor _ ,, rinvunitor_runitor _)). 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.