∀ (R S : Type u_1) [inst : CommRing R] [inst_1 : CommRing S] [inst_2 : Algebra R S] (p : PrimeSpectrum R),
  CategoryTheory.Limits.HasPullback (AlgebraicGeometry.Spec.map (CommRingCat.ofHom (algebraMap R S)))
    ((AlgebraicGeometry.Spec { carrier := R, commRing := inst }).fromSpecResidueField p)