fact: Definition street_fib : UU := ∏ (e : E) (b : B) (f : b --> F e), ∑ (bb : E) (ff_i : bb --> e × z_iso (F bb) b), # F (pr1 ff_i) = pr2 ff_i · f × is_cartesian_sfib (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