fact: Definition is_cartesian_sfib {e₁ e₂ : E} (f : e₁--> e₂) : UU := ∏ (z : E) (g : z --> e₂) (h : F z --> F e₁) (p : #F g = h · #F f), ∃! (φ : z --> e₁), #F φ = h × φ · f = g.
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