∀ {A : Type u_1} {σ : Type u_2} [inst : CommRing A] [inst_1 : SetLike σ A] [inst_2 : AddSubmonoidClass σ A] {𝒜 : ℕ → σ}
  [inst_3 : GradedRing 𝒜] (x : ProjectiveSpectrum 𝒜), ProjectiveSpectrum.vanishingIdeal {x} = x.asHomogeneousIdeal