Definition pb_2cell_on_id {a₁ a₂ b₁ b₂ : B} {f : b₁ --> b₂} {g₁ : a₁ --> b₂} {g₂ : a₂ --> b₂} {h : a₁ --> a₂} (α : invertible_2cell g₁ (h · g₂)) (p : α • (id₂ h ▹ g₂) = α) : f /≃₂ p = id₂ _.
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.