fact: 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 _.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.Bicategories.Core.Bicat UniMath.Bicategories.Core.Unitors UniMath.Bicategories.Core.BicategoryLaws UniMath.Bicategories.Core.Invertible_2cells UniMath.Bicategories.Limits.Pullbacks