∀ {X : AlgebraicGeometry.Scheme} (U : X.Opens) {V W : (TopologicalSpace.Opens ↥↑U)ᵒᵖ} (i : V ⟶ W),
  (↑U).presheaf.map i = X.presheaf.map ((AlgebraicGeometry.Scheme.Hom.opensFunctor U.ι).map i.unop).op