∀ {C : Type u₁} {D : Type u₂} [inst : CategoryTheory.Category.{v₁, u₁} C] [inst_1 : CategoryTheory.Category.{v₂, u₂} D]
  (F : CategoryTheory.Functor C D) [F.Full],
  F.IsDense ↔ Nonempty (CategoryTheory.Presheaf.restrictedULiftYoneda F).FullyFaithful