∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] {X Y : AlgebraicGeometry.PresheafedSpace C} (f : X ⟶ Y)
  [H : AlgebraicGeometry.PresheafedSpace.IsOpenImmersion f] {Z : AlgebraicGeometry.PresheafedSpace C} (h : Y ⟶ Z),
  CategoryTheory.CategoryStruct.comp (AlgebraicGeometry.PresheafedSpace.IsOpenImmersion.isoRestrict f).inv
      (CategoryTheory.CategoryStruct.comp f h) =
    CategoryTheory.CategoryStruct.comp (Y.ofRestrict ⋯) h