∀ {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] {γ : Sort u_3} (I : γ → HomogeneousIdeal 𝒜),
  ProjectiveSpectrum.zeroLocus 𝒜 ↑(⨆ i, I i) = ⋂ i, ProjectiveSpectrum.zeroLocus 𝒜 ↑(I i)