case h₁
R : Type u_2
A : Type u_1
inst✝³ : CommSemiring R
inst✝² : CommRing A
inst✝¹ : Algebra R A
𝒜 : ℕ → Submodule R A
inst✝ : GradedAlgebra 𝒜
t : Set (ProjectiveSpectrum 𝒜)
⊢ zeroLocus 𝒜 ↑(vanishingIdeal t) ⊆ closure t

case h₂
R : Type u_2
A : Type u_1
inst✝³ : CommSemiring R
inst✝² : CommRing A
inst✝¹ : Algebra R A
𝒜 : ℕ → Submodule R A
inst✝ : GradedAlgebra 𝒜
t : Set (ProjectiveSpectrum 𝒜)
⊢ closure t ⊆ zeroLocus 𝒜 ↑(vanishingIdeal t)
R : Type u_2
A : Type u_1
inst✝³ : CommSemiring R
inst✝² : CommRing A
inst✝¹ : Algebra R A
𝒜 : ℕ → Submodule R A
inst✝ : GradedAlgebra 𝒜
t : Set (ProjectiveSpectrum 𝒜)
⊢ zeroLocus 𝒜 ↑(vanishingIdeal t) = closure t
apply Set.Subset.antisymm
case h₁.intro
R : Type u_2
A : Type u_1
inst✝³ : CommSemiring R
inst✝² : CommRing A
inst✝¹ : Algebra R A
𝒜 : ℕ → Submodule R A
inst✝ : GradedAlgebra 𝒜
t : Set (ProjectiveSpectrum 𝒜)
x : ProjectiveSpectrum 𝒜
hx : x ∈ zeroLocus 𝒜 ↑(vanishingIdeal t)
t' : Set (ProjectiveSpectrum 𝒜)
ht' : IsClosed t'
ht : t ⊆ t'
⊢ x ∈ t'
case h₁
R : Type u_2
A : Type u_1
inst✝³ : CommSemiring R
inst✝² : CommRing A
inst✝¹ : Algebra R A
𝒜 : ℕ → Submodule R A
inst✝ : GradedAlgebra 𝒜
t : Set (ProjectiveSpectrum 𝒜)
⊢ zeroLocus 𝒜 ↑(vanishingIdeal t) ⊆ closure t
rintro x hx t' ⟨ht', ht⟩
case h₁.intro.intro
R : Type u_2
A : Type u_1
inst✝³ : CommSemiring R
inst✝² : CommRing A
inst✝¹ : Algebra R A
𝒜 : ℕ → Submodule R A
inst✝ : GradedAlgebra 𝒜
t : Set (ProjectiveSpectrum 𝒜)
x : ProjectiveSpectrum 𝒜
hx : x ∈ zeroLocus 𝒜 ↑(vanishingIdeal t)
fs : Set A
ht' : IsClosed (zeroLocus 𝒜 fs)
ht : t ⊆ zeroLocus 𝒜 fs
⊢ x ∈ zeroLocus 𝒜 fs
case h₁.intro
R : Type u_2
A : Type u_1
inst✝³ : CommSemiring R
inst✝² : CommRing A
inst✝¹ : Algebra R A
𝒜 : ℕ → Submodule R A
inst✝ : GradedAlgebra 𝒜
t : Set (ProjectiveSpectrum 𝒜)
x : ProjectiveSpectrum 𝒜
hx : x ∈ zeroLocus 𝒜 ↑(vanishingIdeal t)
t' : Set (ProjectiveSpectrum 𝒜)
ht' : IsClosed t'
ht : t ⊆ t'
⊢ x ∈ t'
obtain ⟨fs, rfl⟩ : ∃ s, t' = zeroLocus 𝒜 s := by rwa [isClosed_iff_zeroLocus] at ht'
case h₁.intro.intro
R : Type u_2
A : Type u_1
inst✝³ : CommSemiring R
inst✝² : CommRing A
inst✝¹ : Algebra R A
𝒜 : ℕ → Submodule R A
inst✝ : GradedAlgebra 𝒜
t : Set (ProjectiveSpectrum 𝒜)
x : ProjectiveSpectrum 𝒜
hx : x ∈ zeroLocus 𝒜 ↑(vanishingIdeal t)
fs : Set A
ht' : IsClosed (zeroLocus 𝒜 fs)
ht : fs ⊆ ↑(vanishingIdeal t)
⊢ x ∈ zeroLocus 𝒜 fs
case h₁.intro.intro
R : Type u_2
A : Type u_1
inst✝³ : CommSemiring R
inst✝² : CommRing A
inst✝¹ : Algebra R A
𝒜 : ℕ → Submodule R A
inst✝ : GradedAlgebra 𝒜
t : Set (ProjectiveSpectrum 𝒜)
x : ProjectiveSpectrum 𝒜
hx : x ∈ zeroLocus 𝒜 ↑(vanishingIdeal t)
fs : Set A
ht' : IsClosed (zeroLocus 𝒜 fs)
ht : t ⊆ zeroLocus 𝒜 fs
⊢ x ∈ zeroLocus 𝒜 fs
rw [subset_zeroLocus_iff_subset_vanishingIdeal] at ht
no goals
case h₁.intro.intro
R : Type u_2
A : Type u_1
inst✝³ : CommSemiring R
inst✝² : CommRing A
inst✝¹ : Algebra R A
𝒜 : ℕ → Submodule R A
inst✝ : GradedAlgebra 𝒜
t : Set (ProjectiveSpectrum 𝒜)
x : ProjectiveSpectrum 𝒜
hx : x ∈ zeroLocus 𝒜 ↑(vanishingIdeal t)
fs : Set A
ht' : IsClosed (zeroLocus 𝒜 fs)
ht : fs ⊆ ↑(vanishingIdeal t)
⊢ x ∈ zeroLocus 𝒜 fs
exact Set.Subset.trans ht hx
no goals
R : Type u_2
A : Type u_1
inst✝³ : CommSemiring R
inst✝² : CommRing A
inst✝¹ : Algebra R A
𝒜 : ℕ → Submodule R A
inst✝ : GradedAlgebra 𝒜
t : Set (ProjectiveSpectrum 𝒜)
x : ProjectiveSpectrum 𝒜
hx : x ∈ zeroLocus 𝒜 ↑(vanishingIdeal t)
t' : Set (ProjectiveSpectrum 𝒜)
ht' : IsClosed t'
ht : t ⊆ t'
⊢ ∃ s, t' = zeroLocus 𝒜 s
rwa [isClosed_iff_zeroLocus] at ht'
case h₂
R : Type u_2
A : Type u_1
inst✝³ : CommSemiring R
inst✝² : CommRing A
inst✝¹ : Algebra R A
𝒜 : ℕ → Submodule R A
inst✝ : GradedAlgebra 𝒜
t : Set (ProjectiveSpectrum 𝒜)
⊢ t ⊆ zeroLocus 𝒜 ↑(vanishingIdeal t)
case h₂
R : Type u_2
A : Type u_1
inst✝³ : CommSemiring R
inst✝² : CommRing A
inst✝¹ : Algebra R A
𝒜 : ℕ → Submodule R A
inst✝ : GradedAlgebra 𝒜
t : Set (ProjectiveSpectrum 𝒜)
⊢ closure t ⊆ zeroLocus 𝒜 ↑(vanishingIdeal t)
rw [(isClosed_zeroLocus _ _).closure_subset_iff]
no goals
case h₂
R : Type u_2
A : Type u_1
inst✝³ : CommSemiring R
inst✝² : CommRing A
inst✝¹ : Algebra R A
𝒜 : ℕ → Submodule R A
inst✝ : GradedAlgebra 𝒜
t : Set (ProjectiveSpectrum 𝒜)
⊢ t ⊆ zeroLocus 𝒜 ↑(vanishingIdeal t)
exact subset_zeroLocus_vanishingIdeal 𝒜 t