Definition pb_pr2 {b₁ b₂ b₃ : B} (f : b₁ --> b₃) (g : b₂ --> b₃) : f /≃ g --> b₂ := pb_cone_pr2 (pr1 (pr2 B _ _ _ f g)).
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.Unitors. Require Import UniMath.Bicategories.Core.BicategoryLaws. Require Import UniMath.Bicategories.Core.Invertible_2cells. Require Import UniMath.Bicategories.Limits.Pullbacks.