∀ {X Y : AlgebraicGeometry.Scheme} (f : X ⟶ Y) {U : Y.Opens} {V : X.Opens}
  (e : V ≤ (TopologicalSpace.Opens.map f.base).obj U),
  CategoryTheory.CategoryStruct.comp (AlgebraicGeometry.Scheme.Hom.resLE f U V e) U.ι =
    CategoryTheory.CategoryStruct.comp V.ι f