∀ {X : AlgebraicGeometry.Scheme} (U : ↑X.affineOpens) (f : ↑(X.presheaf.obj (Opposite.op ↑U))),
  Ideal.map (CommRingCat.Hom.hom (X.presheaf.map (CategoryTheory.homOfLE ⋯).op)) (⊤ U) = ⊤ (X.affineBasicOpen f)