∀ {σ : Type u_2} {A : Type u_1} [inst : CommRing A] [inst_1 : SetLike σ A] [inst_2 : AddSubgroupClass σ A] (𝒜 : ℕ → σ)
  [inst_3 : GradedRing 𝒜] (x : ↥(AlgebraicGeometry.Proj 𝒜)), x.asHomogeneousIdeal.toIdeal.IsPrime