{C : Type u} →
  [inst : CategoryTheory.Category.{v, u} C] →
    {X Y : AlgebraicGeometry.PresheafedSpace C} →
      (f : X ⟶ Y) → [H : AlgebraicGeometry.PresheafedSpace.IsOpenImmersion f] → X ≅ Y.restrict ⋯