fact: Definition to_pb_cartesian {x : B} {g₁ g₂ : x --> e₁} (α : g₁ ==> g₂) (Hα : is_cartesian_2cell_sfib p₂ (α ▹ fe)) : is_cartesian_2cell_sfib p₁ α.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.Bicategories.Core.Bicat UniMath.Bicategories.Core.Invertible_2cells UniMath.Bicategories.Core.Examples.OpCellBicat UniMath.Bicategories.Morphisms.FullyFaithful UniMath.Bicategories.Morphisms.DiscreteMorphisms UniMath.Bicategories.Morphisms.InternalStreetFibration UniMath.Bicategories.Morphisms.InternalStreetOpFibration UniMath.Bicategories.Morphisms.Properties.Composition UniMath.Bicategories.Limits.Pullbacks UniMath.Bicategories.Limits.Examples.OpCellBicatLimits