Definition pb_1cell_pr1 {p q : pb_cone} (φ : pb_1cell p q) : invertible_2cell (φ · pb_cone_pr1 q) (pb_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.