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Merge pull request #40 from GTBarkley/leo

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Leo Mayer 2023-06-13 14:19:34 -07:00 committed by GitHub
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CommAlg/krull.lean
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@ -45,6 +45,12 @@ lemma krullDim_le_iff (R : Type) [CommRing R] (n : ℕ) :
lemma krullDim_le_iff' (R : Type) [CommRing R] (n : ℕ∞) :
krullDim R ≤ n ↔ ∀ I : PrimeSpectrum R, (height I : WithBot ℕ∞) ≤ ↑n := iSup_le_iff (α := WithBot ℕ∞)
lemma le_krullDim_iff (R : Type) [CommRing R] (n : ℕ) :
n ≤ krullDim R ↔ ∃ I : PrimeSpectrum R, n ≤ (height I : WithBot ℕ∞) := by sorry
lemma le_krullDim_iff' (R : Type) [CommRing R] (n : ℕ∞) :
n ≤ krullDim R ↔ ∃ I : PrimeSpectrum R, n ≤ (height I : WithBot ℕ∞) := by sorry
@[simp]
lemma height_le_krullDim (I : PrimeSpectrum R) : height I ≤ krullDim R :=
le_iSup (λ I : PrimeSpectrum R => (height I : WithBot ℕ∞)) I