fact: Definition lwhisker_is_opcartesian : UU := ∏ (x y : B) (h : y --> x) (f g : x --> e) (γ : f ==> g) (Hγ : is_opcartesian_2cell_sopfib γ), is_opcartesian_2cell_sopfib (h ◃ γ).
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.Core.Univalence UniMath.Bicategories.Core.UnivalenceOp UniMath.Bicategories.Morphisms.InternalStreetFibration