∀ (X : AlgebraicGeometry.RingedSpace) {U V : (TopologicalSpace.Opens ↑↑X.toPresheafedSpace)ᵒᵖ} (i : U ⟶ V)
  [CategoryTheory.IsIso i] (f : ↑(X.presheaf.obj U)),
  X.basicOpen ((CategoryTheory.ConcreteCategory.hom (X.presheaf.map i)) f) = X.basicOpen f