fact: Definition street_opfib : UU := ∏ (e : E) (b : B) (f : F e --> b), ∑ (bb : E) (ff_i : e --> bb × z_iso b (F bb)), # F (pr1 ff_i) = f · pr2 ff_i × is_opcartesian_sopfib (pr1 ff_i).
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.DisplayedCats.Core UniMath.CategoryTheory.DisplayedCats.Total UniMath.CategoryTheory.DisplayedCats.Fibrations