Theorem: Ideal.finprod_heightOneSpectrum_factorization
File: Mathlib/RingTheory/DedekindDomain/Factorization.lean

tactic: rw [← associated_iff_eq, ← Associates.mk_eq_mk_iff_associated]
state_before: R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
⊢ ∏ᶠ (v : HeightOneSpectrum R), v.maxPowDividing I = I
state_after: R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
⊢ Associates.mk (∏ᶠ (v : HeightOneSpectrum R), v.maxPowDividing I) = Associates.mk I

tactic: apply Associates.eq_of_eq_counts
state_before: R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
⊢ Associates.mk (∏ᶠ (v : HeightOneSpectrum R), v.maxPowDividing I) = Associates.mk I
state_after: case ha
R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
⊢ Associates.mk (∏ᶠ (v : HeightOneSpectrum R), v.maxPowDividing I) ≠ 0

case hb
R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
⊢ Associates.mk I ≠ 0

case h
R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
⊢ ∀ (p : Associates (Ideal R)),
    Irreducible p →
      p.count (Associates.mk (∏ᶠ (v : HeightOneSpectrum R), v.maxPowDividing I)).factors =
        p.count (Associates.mk I).factors

tactic: intro v hv
state_before: case h
R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
⊢ ∀ (p : Associates (Ideal R)),
    Irreducible p →
      p.count (Associates.mk (∏ᶠ (v : HeightOneSpectrum R), v.maxPowDividing I)).factors =
        p.count (Associates.mk I).factors
state_after: case h
R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v✝ : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
v : Associates (Ideal R)
hv : Irreducible v
⊢ v.count (Associates.mk (∏ᶠ (v : HeightOneSpectrum R), v.maxPowDividing I)).factors = v.count (Associates.mk I).factors

tactic: obtain ⟨J, hJv⟩ := Associates.exists_rep v
state_before: case h
R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v✝ : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
v : Associates (Ideal R)
hv : Irreducible v
⊢ v.count (Associates.mk (∏ᶠ (v : HeightOneSpectrum R), v.maxPowDividing I)).factors = v.count (Associates.mk I).factors
state_after: case h.intro
R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v✝ : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
v : Associates (Ideal R)
hv : Irreducible v
J : Ideal R
hJv : Associates.mk J = v
⊢ v.count (Associates.mk (∏ᶠ (v : HeightOneSpectrum R), v.maxPowDividing I)).factors = v.count (Associates.mk I).factors

tactic: rw [← hJv, Associates.irreducible_mk] at hv
state_before: case h.intro
R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v✝ : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
v : Associates (Ideal R)
hv : Irreducible v
J : Ideal R
hJv : Associates.mk J = v
⊢ v.count (Associates.mk (∏ᶠ (v : HeightOneSpectrum R), v.maxPowDividing I)).factors = v.count (Associates.mk I).factors
state_after: case h.intro
R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v✝ : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
v : Associates (Ideal R)
J : Ideal R
hv : Irreducible J
hJv : Associates.mk J = v
⊢ v.count (Associates.mk (∏ᶠ (v : HeightOneSpectrum R), v.maxPowDividing I)).factors = v.count (Associates.mk I).factors

tactic: rw [← hJv]
state_before: case h.intro
R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v✝ : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
v : Associates (Ideal R)
J : Ideal R
hv : Irreducible J
hJv : Associates.mk J = v
⊢ v.count (Associates.mk (∏ᶠ (v : HeightOneSpectrum R), v.maxPowDividing I)).factors = v.count (Associates.mk I).factors
state_after: case h.intro
R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v✝ : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
v : Associates (Ideal R)
J : Ideal R
hv : Irreducible J
hJv : Associates.mk J = v
⊢ (Associates.mk J).count (Associates.mk (∏ᶠ (v : HeightOneSpectrum R), v.maxPowDividing I)).factors =
    (Associates.mk J).count (Associates.mk I).factors

tactic: apply Ideal.finprod_count
  ⟨J, Ideal.isPrime_of_prime (irreducible_iff_prime.mp hv), Irreducible.ne_zero hv⟩ I hI
state_before: case h.intro
R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v✝ : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
v : Associates (Ideal R)
J : Ideal R
hv : Irreducible J
hJv : Associates.mk J = v
⊢ (Associates.mk J).count (Associates.mk (∏ᶠ (v : HeightOneSpectrum R), v.maxPowDividing I)).factors =
    (Associates.mk J).count (Associates.mk I).factors
state_after: no goals

tactic: apply Associates.finprod_ne_zero I
state_before: case ha
R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
⊢ Associates.mk (∏ᶠ (v : HeightOneSpectrum R), v.maxPowDividing I) ≠ 0
state_after: no goals

tactic: apply Associates.mk_ne_zero.mpr hI
state_before: case hb
R : Type u_1
inst✝⁴ : CommRing R
K : Type u_2
inst✝³ : Field K
inst✝² : Algebra R K
inst✝¹ : IsFractionRing R K
inst✝ : IsDedekindDomain R
v : HeightOneSpectrum R
I : Ideal R
hI : I ≠ 0
⊢ Associates.mk I ≠ 0
state_after: no goals