∀ {A : Type u_1} {σ : Type u_2} [inst : CommRing A] [inst_1 : SetLike σ A] [inst_2 : AddSubgroupClass σ A] (𝒜 : ℕ → σ)
  [inst_3 : GradedRing 𝒜] (x : ↑(ProjectiveSpectrum.top 𝒜)) (U : (TopologicalSpace.OpenNhds x)ᵒᵖ),
  x ∈ ↑(Opposite.unop U)