∀ {F : CategoryTheory.Sheaf AlgebraicGeometry.Scheme.zariskiTopology (Type u_1)} {ι : Type u_1}
  {X : ι → AlgebraicGeometry.Scheme} {f : (i : ι) → CategoryTheory.yoneda.obj (X i) ⟶ F.val}
  (hf : ∀ (i : ι), AlgebraicGeometry.IsOpenImmersion.presheaf (f i)) (i j : ι),
  AlgebraicGeometry.IsOpenImmersion (⋯.fst' (f j))