proposition: Lemma uf0 {c1 c2 : C} (f : C⟦c1,c2⟧) : ∏ (d1 : D c1) (d2 : D c2), iscontr (d1 -->[f] d2).
proof: Proof. intros d1 d2. use (iscontrweqb' (is_contr_disp_mor _ _ f)). apply uf_eq. Defined.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.catiso UniMath.CategoryTheory.DisplayedCats.Core UniMath.CategoryTheory.DisplayedCats.Isos UniMath.CategoryTheory.DisplayedCats.Total UniMath.CategoryTheory.DisplayedCats.Univalence