Definition comma_1cell_pr2 {p q : comma_cone} (φ : comma_1cell p q) : invertible_2cell (φ · comma_cone_pr2 q) (comma_cone_pr2 p) := pr122 φ.
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.Univalence.