Definition comma_1cell_pr1 {p q : comma_cone} (φ : comma_1cell p q) : invertible_2cell (φ · comma_cone_pr1 q) (comma_cone_pr1 p) := pr12 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.