mathlib-initiative/mathlib-tactics huggingface dataset:
Module: Mathlib.RingTheory.IntegralClosure.IntegralRestrict

Goal state before:
pp: case neg
A : Type u_1
B : Type u_6
inst✝⁸ : CommRing A
inst✝⁷ : CommRing B
inst✝⁶ : Algebra A B
inst✝⁵ : IsDomain A
inst✝⁴ : IsIntegrallyClosed A
inst✝³ : IsDomain B
inst✝² : IsIntegrallyClosed B
inst✝¹ : Module.Finite A B
inst✝ : IsTorsionFree A B
x : B
this✝ : FiniteDimensional (FractionRing A) (FractionRing B)
hx : ¬x = 0
K : Type u_1 := FractionRing A
L : Type u_6 := FractionRing B
E : Type u_6 := AlgebraicClosure L
this : IsTorsionFree B E
⊢ IsIntegral A
    ((algebraMap B E) x ^ (finrank (↥K⟮(algebraMap B L) x⟯) L - 1) *
      (((minpoly K ((algebraMap B L) x)).aroots E).erase ((algebraMap B E) x)).prod ^
        finrank (↥K⟮(algebraMap B L) x⟯) L)

Tactic:
refine IsIntegral.mul (IsIntegral.pow ?_ _)
        (IsIntegral.pow (IsIntegral.multiset_prod (fun a ha ↦ ⟨minpoly A x, minpoly.monic
          (IsIntegral.isIntegral x), ?_⟩)) _)
      · exact (isIntegral_algebraMap_iff (isTorsionFree_iff_algebraMap_injective.1 this)).mpr
          (IsIntegral.isIntegral x)
      · replace ha := Multiset.erase_subset _ _ ha
        suffices (aeval a) ((minpoly A x).map (algebraMap A K)) = 0 by simpa
        rw [← minpoly.isIntegrallyClosed_eq_field_fractions K L (IsIntegral.isIntegral x)]
        simp only [mem_roots', ne_eq, Polynomial.map_eq_zero, IsRoot.def, eval_map_algebraMap] at ha
        exact ha.2

Goal state after:
Module: Mathlib.NumberTheory.RamificationInertia.Galois

Goal state before:
pp: R : Type u_1
S : Type u_2
G : Type u_3
inst✝¹⁰ : CommRing R
inst✝⁹ : CommRing S
inst✝⁸ : Algebra R S
inst✝⁷ : Group G
inst✝⁶ : MulSemiringAction G S
inst✝⁵ : IsGaloisGroup G R S
inst✝⁴ : Finite G
p : Ideal R
inst✝³ : p.IsPrime
P : Ideal S
inst✝² : P.LiesOver p
inst✝¹ : P.IsPrime
inst✝ : PerfectField p.ResidueField
this✝⁵ : Algebra (Localization.AtPrime p) (Localization.AtPrime P) := Localization.AtPrime.algebraOfLiesOver p P
heq :
  (algebraMap (S ⧸ P) P.ResidueField).comp (algebraMap (R ⧸ p) (S ⧸ P)) =
    (algebraMap p.ResidueField P.ResidueField).comp (algebraMap (R ⧸ p) p.ResidueField)
this✝⁴ : Algebra (R ⧸ p) P.ResidueField :=
  ((algebraMap (S ⧸ P) P.ResidueField).comp (algebraMap (R ⧸ p) (S ⧸ P))).toAlgebra
this✝³ : IsScalarTower (R ⧸ p) (S ⧸ P) P.ResidueField
this✝² : IsScalarTower (R ⧸ p) p.ResidueField P.ResidueField
this✝¹ : IsGalois p.ResidueField P.ResidueField
this✝ : Module.Finite p.ResidueField P.ResidueField
this : (inertia (↥(MulAction.stabilizer G P)) P).index = Nat.card Gal(P.ResidueField/p.ResidueField)
⊢ Nat.card ↥(MulAction.stabilizer G P) = Nat.card ↥(inertia G P) * (inertia (↥(MulAction.stabilizer G P)) P).index

Tactic:
← ((inertia G P).subgroupOf (MulAction.stabilizer G P)).card_mul_index,

Goal state after:
R : Type u_1
S : Type u_2
G : Type u_3
inst✝¹⁰ : CommRing R
inst✝⁹ : CommRing S
inst✝⁸ : Algebra R S
inst✝⁷ : Group G
inst✝⁶ : MulSemiringAction G S
inst✝⁵ : IsGaloisGroup G R S
inst✝⁴ : Finite G
p : Ideal R
inst✝³ : p.IsPrime
P : Ideal S
inst✝² : P.LiesOver p
inst✝¹ : P.IsPrime
inst✝ : PerfectField p.ResidueField
this✝⁵ : Algebra (Localization.AtPrime p) (Localization.AtPrime P) := Localization.AtPrime.algebraOfLiesOver p P
heq :
  (algebraMap (S ⧸ P) P.ResidueField).comp (algebraMap (R ⧸ p) (S ⧸ P)) =
    (algebraMap p.ResidueField P.ResidueField).comp (algebraMap (R ⧸ p) p.ResidueField)
this✝⁴ : Algebra (R ⧸ p) P.ResidueField :=
  ((algebraMap (S ⧸ P) P.ResidueField).comp (algebraMap (R ⧸ p) (S ⧸ P))).toAlgebra
this✝³ : IsScalarTower (R ⧸ p) (S ⧸ P) P.ResidueField
this✝² : IsScalarTower (R ⧸ p) p.ResidueField P.ResidueField
this✝¹ : IsGalois p.ResidueField P.ResidueField
this✝ : Module.Finite p.ResidueField P.ResidueField
this : (inertia (↥(MulAction.stabilizer G P)) P).index = Nat.card Gal(P.ResidueField/p.ResidueField)
⊢ Nat.card ↥((inertia G P).subgroupOf (MulAction.stabilizer G P)) *
      ((inertia G P).subgroupOf (MulAction.stabilizer G P)).index =
    Nat.card ↥(inertia G P) * (inertia (↥(MulAction.stabilizer G P)) P).index
Module: Mathlib.NumberTheory.NumberField.ClassNumber

Goal state before:
pp: case refine_2
K : Type u_1
inst✝¹ : Field K
inst✝ : NumberField K
C : ClassGroup (𝓞 K)
J : ↥(Ideal (𝓞 K))⁰
hJ : ClassGroup.mk0 J = C⁻¹
a : 𝓞 K
ha : a ∈ ↑↑J
h_nz : (Algebra.linearMap (𝓞 K) K) a ≠ 0
h_nm :
  ↑|(Algebra.norm ℚ) ((Algebra.linearMap (𝓞 K) K) a)| ≤
    ↑(FractionalIdeal.absNorm ↑((FractionalIdeal.mk0 K) J)) * (4 / π) ^ nrComplexPlaces K * ↑(finrank ℚ K)! /
        ↑(finrank ℚ K) ^ finrank ℚ K *
      √|↑(discr K)|
I₀ : Ideal (𝓞 K)
hI : span {a} = ↑J * I₀
this : I₀ ≠ 0
I : ↥(Ideal (𝓞 K))⁰ := ⟨I₀, ⋯⟩
⊢ ↑(absNorm ↑I) ≤ (4 / π) ^ nrComplexPlaces K * (↑(finrank ℚ K)! / ↑(finrank ℚ K) ^ finrank ℚ K * √|↑(discr K)|)

Tactic:
rw [← FractionalIdeal.absNorm_span_singleton (𝓞 K), Algebra.linearMap_apply,
      ← FractionalIdeal.coeIdeal_span_singleton, FractionalIdeal.coeIdeal_absNorm, hI, map_mul,
      cast_mul, Rat.cast_mul, absNorm_apply, Rat.cast_natCast, Rat.cast_natCast,
      FractionalIdeal.coe_mk0, FractionalIdeal.coeIdeal_absNorm, Rat.cast_natCast, mul_div_assoc,
      mul_assoc, mul_assoc] at h_nm

Goal state after:
case refine_2
K : Type u_1
inst✝¹ : Field K
inst✝ : NumberField K
C : ClassGroup (𝓞 K)
J : ↥(Ideal (𝓞 K))⁰
hJ : ClassGroup.mk0 J = C⁻¹
a : 𝓞 K
ha : a ∈ ↑↑J
h_nz : (Algebra.linearMap (𝓞 K) K) a ≠ 0
I₀ : Ideal (𝓞 K)
h_nm :
  ↑(Submodule.cardQuot ↑J) * ↑(absNorm I₀) ≤
    ↑(absNorm ↑J) * ((4 / π) ^ nrComplexPlaces K * (↑(finrank ℚ K)! / ↑(finrank ℚ K) ^ finrank ℚ K * √|↑(discr K)|))
hI : span {a} = ↑J * I₀
this : I₀ ≠ 0
I : ↥(Ideal (𝓞 K))⁰ := ⟨I₀, ⋯⟩
⊢ ↑(absNorm ↑I) ≤ (4 / π) ^ nrComplexPlaces K * (↑(finrank ℚ K)! / ↑(finrank ℚ K) ^ finrank ℚ K * √|↑(discr K)|)
Module: Mathlib.NumberTheory.RamificationInertia.Unramified

Goal state before:
pp: R : Type u_1
S : Type u_2
inst✝⁷ : CommRing R
inst✝⁶ : CommRing S
inst✝⁵ : Algebra R S
inst✝⁴ : IsDomain R
inst✝³ : IsDomain S
inst✝² : Module.IsTorsionFree R S
inst✝¹ : CharZero R
inst✝ : Algebra.IsIntegral R S
⊢ IsFractionRing S (Localization.AtPrime ⊥)

Tactic:
simpa [Ideal.primeCompl_bot] using Localization.isLocalization (M := (⊥ : Ideal S).primeCompl)

Goal state after:
Module: Mathlib.RingTheory.FractionalIdeal.Extended

Goal state before:
pp: A : Type u_1
inst✝⁷ : CommRing A
B : Type u_2
inst✝⁶ : CommRing B
f : A →+* B
K : Type u_3
M : Submonoid A
inst✝⁵ : CommRing K
inst✝⁴ : Algebra A K
inst✝³ : IsLocalization M K
L : Type u_4
N : Submonoid B
inst✝² : CommRing L
inst✝¹ : Algebra B L
inst✝ : IsLocalization N L
hf : M ≤ Submonoid.comap f N
x : K
x✝ : L
⊢ x✝ ∈ span B (⇑(IsLocalization.map L f hf) '' ↑(spanSingleton M x)) ↔ ∃ z, z • (IsLocalization.map L f hf) x = x✝

Tactic:
← mem_span_singleton

Goal state after:
A : Type u_1
inst✝⁷ : CommRing A
B : Type u_2
inst✝⁶ : CommRing B
f : A →+* B
K : Type u_3
M : Submonoid A
inst✝⁵ : CommRing K
inst✝⁴ : Algebra A K
inst✝³ : IsLocalization M K
L : Type u_4
N : Submonoid B
inst✝² : CommRing L
inst✝¹ : Algebra B L
inst✝ : IsLocalization N L
hf : M ≤ Submonoid.comap f N
x : K
x✝ : L
⊢ x✝ ∈ span B (⇑(IsLocalization.map L f hf) '' ↑(spanSingleton M x)) ↔ x✝ ∈ B ∙ (IsLocalization.map L f hf) x
Module: Mathlib.RingTheory.DedekindDomain.PID

Goal state before:
pp: case a
R : Type u_1
inst✝³ : CommRing R
A : Type u_2
inst✝² : CommRing A
inst✝¹ : Algebra R A
S : Submonoid R
inst✝ : IsLocalization S A
hS : S ≤ R⁰
hf : {I | I.IsMaximal}.Finite
I I' : FractionalIdeal S A
hinv : ↑I * ↑I' = ↑1
hinv' : I * I' = 1
s : Finset (Ideal R) := hf.toFinset
this✝ : DecidableEq (Ideal R)
coprime : ∀ M ∈ s, ∀ M' ∈ s.erase M, M ⊔ M' = ⊤
nle : ∀ M ∈ s, ¬⨅ M' ∈ s.erase M, M' ≤ M
a : Ideal R → A
ha : ∀ M ∈ s, a M ∈ I
b : Ideal R → A
hb : ∀ M ∈ s, b M ∈ I'
hm : ∀ M ∈ s, a M * b M ∉ IsLocalization.coeSubmodule A M
u : Ideal R → R
hu : ∀ M ∈ s, u M ∈ ⨅ M' ∈ s.erase M, M'
hum : ∀ M ∈ s, u M ∉ M
v : A := ∑ M ∈ s, u M • b M
hv : v ∈ I'
h : ¬Submodule.comap (Algebra.linearMap R A) (↑↑(Units.mkOfMulEqOne I I' hinv') * (R ∙ v)) = ⊤
M : Ideal R
hJM : Submodule.comap (Algebra.linearMap R A) (↑↑(Units.mkOfMulEqOne I I' hinv') * (R ∙ v)) ≤ M
hM : M ∈ hf.toFinset
this : ∀ a ∈ I, ∀ b ∈ I', ∃ c, (algebraMap R A) c = a * b
hmem : u M • (a M * b M) + ∑ x ∈ s.erase M, u x • (a M * b x) ∈ IsLocalization.coeSubmodule A M
M' : Ideal R
hM' : M' ≠ M ∧ M' ∈ s
c : R
hc : (algebraMap R A) c = a M * b M'
⊢ u M' • (a M * b M') ∈ IsLocalization.coeSubmodule A M

Tactic:
rw [← hc, Algebra.smul_def, ← map_mul]

Goal state after:
case a
R : Type u_1
inst✝³ : CommRing R
A : Type u_2
inst✝² : CommRing A
inst✝¹ : Algebra R A
S : Submonoid R
inst✝ : IsLocalization S A
hS : S ≤ R⁰
hf : {I | I.IsMaximal}.Finite
I I' : FractionalIdeal S A
hinv : ↑I * ↑I' = ↑1
hinv' : I * I' = 1
s : Finset (Ideal R) := hf.toFinset
this✝ : DecidableEq (Ideal R)
coprime : ∀ M ∈ s, ∀ M' ∈ s.erase M, M ⊔ M' = ⊤
nle : ∀ M ∈ s, ¬⨅ M' ∈ s.erase M, M' ≤ M
a : Ideal R → A
ha : ∀ M ∈ s, a M ∈ I
b : Ideal R → A
hb : ∀ M ∈ s, b M ∈ I'
hm : ∀ M ∈ s, a M * b M ∉ IsLocalization.coeSubmodule A M
u : Ideal R → R
hu : ∀ M ∈ s, u M ∈ ⨅ M' ∈ s.erase M, M'
hum : ∀ M ∈ s, u M ∉ M
v : A := ∑ M ∈ s, u M • b M
hv : v ∈ I'
h : ¬Submodule.comap (Algebra.linearMap R A) (↑↑(Units.mkOfMulEqOne I I' hinv') * (R ∙ v)) = ⊤
M : Ideal R
hJM : Submodule.comap (Algebra.linearMap R A) (↑↑(Units.mkOfMulEqOne I I' hinv') * (R ∙ v)) ≤ M
hM : M ∈ hf.toFinset
this : ∀ a ∈ I, ∀ b ∈ I', ∃ c, (algebraMap R A) c = a * b
hmem : u M • (a M * b M) + ∑ x ∈ s.erase M, u x • (a M * b x) ∈ IsLocalization.coeSubmodule A M
M' : Ideal R
hM' : M' ≠ M ∧ M' ∈ s
c : R
hc : (algebraMap R A) c = a M * b M'
⊢ (algebraMap R A) (u M' * c) ∈ IsLocalization.coeSubmodule A M
Module: Mathlib.NumberTheory.NumberField.Discriminant.Different

Goal state before:
pp: K : Type u_1
inst✝⁴ : Field K
inst✝³ : NumberField K
L : Type u_3
inst✝² : Field L
inst✝¹ : NumberField L
inst✝ : Algebra K L
⊢ discr K ^ finrank K L ∣ discr L

Tactic:
rw [← Int.dvd_natAbs, natAbs_discr_eq_absNorm_differentIdeal_mul_natAbs_discr_pow K (𝓞 K) L (𝓞 L),
    Nat.cast_mul, Nat.cast_pow, ← Int.mul_sign_self, mul_pow, ← mul_assoc,
    mul_comm _ (discr K ^ _), mul_assoc]

Goal state after:
K : Type u_1
inst✝⁴ : Field K
inst✝³ : NumberField K
L : Type u_3
inst✝² : Field L
inst✝¹ : NumberField L
inst✝ : Algebra K L
⊢ discr K ^ finrank K L ∣
    discr K ^ finrank K L * (↑(Ideal.absNorm (differentIdeal (𝓞 K) (𝓞 L))) * (discr K).sign ^ finrank K L)
Module: Mathlib.RingTheory.Polynomial.Eisenstein.IsIntegral

Goal state before:
pp: case refine_3
p : ℕ
hp : Fact (Nat.Prime p)
⊢ eval 1 (∑ i ∈ range p, X ^ i) ∉ (ℤ ∙ ↑p) ^ 2

Tactic:
eval_geom_sum,

Goal state after:
case refine_3
p : ℕ
hp : Fact (Nat.Prime p)
⊢ ∑ i ∈ range p, 1 ^ i ∉ (ℤ ∙ ↑p) ^ 2
Module: Mathlib.RingTheory.Ideal.Norm.RelNorm

Goal state before:
pp: case pos
R : Type u_1
inst✝¹³ : CommRing R
inst✝¹² : IsDomain R
S : Type u_3
inst✝¹¹ : CommRing S
inst✝¹⁰ : IsDomain S
inst✝⁹ : IsIntegrallyClosed R
inst✝⁸ : IsIntegrallyClosed S
inst✝⁷ : Algebra R S
inst✝⁶ : Module.Finite R S
inst✝⁵ : IsTorsionFree R S
inst✝⁴ : IsDedekindDomain R
inst✝³ : IsDedekindDomain S
P : Ideal S
p : Ideal R
hPp : P.LiesOver p
inst✝² : p.IsMaximal
inst✝¹ : P.IsPrime
inst✝ : IsGalois (FractionRing R) (FractionRing S)
this✝¹ : P.IsMaximal
G : Type u_3 := Gal(FractionRing S/FractionRing R)
this✝ : MulSemiringAction Gal(FractionRing S/FractionRing R) S :=
  IsIntegralClosure.MulSemiringAction R (FractionRing R) (FractionRing S) S
this : IsGaloisGroup G R S
hp : p = ⊥
⊢ (relNorm R) P = p ^ P.inertiaDeg R

Tactic:
have h : P.inertiaDeg R ≠ 0 := (inertiaDeg_pos P R).ne'

Goal state after:
case pos
R : Type u_1
inst✝¹³ : CommRing R
inst✝¹² : IsDomain R
S : Type u_3
inst✝¹¹ : CommRing S
inst✝¹⁰ : IsDomain S
inst✝⁹ : IsIntegrallyClosed R
inst✝⁸ : IsIntegrallyClosed S
inst✝⁷ : Algebra R S
inst✝⁶ : Module.Finite R S
inst✝⁵ : IsTorsionFree R S
inst✝⁴ : IsDedekindDomain R
inst✝³ : IsDedekindDomain S
P : Ideal S
p : Ideal R
hPp : P.LiesOver p
inst✝² : p.IsMaximal
inst✝¹ : P.IsPrime
inst✝ : IsGalois (FractionRing R) (FractionRing S)
this✝¹ : P.IsMaximal
G : Type u_3 := Gal(FractionRing S/FractionRing R)
this✝ : MulSemiringAction Gal(FractionRing S/FractionRing R) S :=
  IsIntegralClosure.MulSemiringAction R (FractionRing R) (FractionRing S) S
this : IsGaloisGroup G R S
hp : p = ⊥
h : P.inertiaDeg R ≠ 0
⊢ (relNorm R) P = p ^ P.inertiaDeg R
Module: Mathlib.RingTheory.Polynomial.Eisenstein.IsIntegral

Goal state before:
pp: case refine_2.succ
p : ℕ
hp : Fact (Nat.Prime p)
n : ℕ
hn : ∀ {n_1 : ℕ}, n_1 < p ^ n * (p - 1) → ((cyclotomic (p ^ (n + 1)) ℤ).comp (X + C 1)).coeff n_1 ∈ ℤ ∙ ↑p
i k : ℕ
hi : p * k < p * (p ^ n * (p - 1))
hk : i = p * k
⊢ ((cyclotomic (p ^ (n + 1)) (ZMod p)).comp (X + 1)).coeff (i / p) = 0

Tactic:
rw [hk, mul_comm, Nat.mul_div_cancel _ hp.out.pos]

Goal state after:
case refine_2.succ
p : ℕ
hp : Fact (Nat.Prime p)
n : ℕ
hn : ∀ {n_1 : ℕ}, n_1 < p ^ n * (p - 1) → ((cyclotomic (p ^ (n + 1)) ℤ).comp (X + C 1)).coeff n_1 ∈ ℤ ∙ ↑p
i k : ℕ
hi : p * k < p * (p ^ n * (p - 1))
hk : i = p * k
⊢ ((cyclotomic (p ^ (n + 1)) (ZMod p)).comp (X + 1)).coeff k = 0
Module: Mathlib.RingTheory.Ideal.Norm.RelNorm

Goal state before:
pp: R : Type u_1
inst✝¹⁴ : CommRing R
inst✝¹³ : IsDomain R
S : Type u_3
inst✝¹² : CommRing S
inst✝¹¹ : IsDomain S
inst✝¹⁰ : IsIntegrallyClosed R
inst✝⁹ : IsIntegrallyClosed S
inst✝⁸ : Algebra R S
inst✝⁷ : Module.Finite R S
inst✝⁶ : IsTorsionFree R S
inst✝⁵ : IsDedekindDomain R
inst✝⁴ : IsDedekindDomain S
inst✝³ : Free ℤ R
inst✝² : Free ℤ S
inst✝¹ : Module.Finite ℤ S
inst✝ : PerfectField (FractionRing R)
I : Ideal S
⊢ absNorm ((relNorm R) I) = absNorm I

Tactic:
have : Module.Finite ℤ R := Module.Finite.left ℤ R S
  by_cases hI : I = ⊥
  · simp [hI]
  rw [← prod_normalizedFactors_eq_self hI]
  refine Multiset.prod_induction (fun I ↦ absNorm (relNorm R I) = absNorm I) _ ?_ ?_ ?_
  · intro _ _ hx hy
    rw [map_mul, map_mul, map_mul, hx, hy]
  · simp
  · intro Q hQ
    have hQ' : Q ≠ ⊥ := ne_zero_of_mem_normalizedFactors hQ
    rw [Ideal.mem_normalizedFactors_iff hI] at hQ
    have : Q.IsMaximal := Ring.DimensionLEOne.maximalOfPrime hQ' hQ.1
    let P := under R Q
    let p := absNorm (under ℤ P)
    have : Q.LiesOver (span {(p : ℤ)}) := LiesOver.trans Q P _
    rw [relNorm_eq_pow_of_isMaximal Q P, map_pow, ← pow_inertiaDeg p, ← pow_inertiaDeg p,
      ← pow_mul, ← inertiaDeg_tower]

Goal state after:
Module: Mathlib.RingTheory.Prime

Goal state before:
pp: R : Type u_1
inst✝² : CommMonoidWithZero R
inst✝¹ : IsCancelMulZero R
α : Type u_2
inst✝ : DecidableEq α
p : α → R
i : α
s : Finset α
his : i ∉ s
ih :
  ∀ {x y a : R},
    (∀ i ∈ s, Prime (p i)) →
      x * y = a * ∏ i ∈ s, p i →
        ∃ t u b c, t ∪ u = s ∧ Disjoint t u ∧ a = b * c ∧ x = b * ∏ i ∈ t, p i ∧ y = c * ∏ i ∈ u, p i
a : R
hp : ∀ i_1 ∈ insert i s, Prime (p i_1)
hpi : Prime (p i)
t u : Finset α
c : R
htus : t ∪ u = s
htu : Disjoint t u
hit : i ∉ t
hiu : i ∉ u
d : R
hbc : a = d * c
hx : (p i * d * ∏ i ∈ t, p i) * (c * ∏ i ∈ u, p i) = a * p i * ∏ x ∈ s, p x
⊢ insert i t ∪ u = insert i s

Tactic:
rw [insert_union, htus]

Goal state after:
Module: Mathlib.NumberTheory.NumberField.Cyclotomic.Basic

Goal state before:
pp: p k : ℕ
K : Type u
inst✝² : Field K
ζ : K
hp : Fact (Nat.Prime p)
inst✝¹ : CharZero K
inst✝ : IsCyclotomicExtension {p ^ k} ℚ K
hζ : IsPrimitiveRoot ζ (p ^ k)
⊢ ∃ u n, Algebra.discr ℚ ⇑(IsPrimitiveRoot.subOnePowerBasis ℚ hζ).basis = ↑↑u * ↑p ^ n

Tactic:
rw [hζ.discr_zeta_eq_discr_zeta_sub_one.symm]

Goal state after:
p k : ℕ
K : Type u
inst✝² : Field K
ζ : K
hp : Fact (Nat.Prime p)
inst✝¹ : CharZero K
inst✝ : IsCyclotomicExtension {p ^ k} ℚ K
hζ : IsPrimitiveRoot ζ (p ^ k)
⊢ ∃ u n, Algebra.discr ℚ ⇑(IsPrimitiveRoot.powerBasis ℚ hζ).basis = ↑↑u * ↑p ^ n
Module: Mathlib.NumberTheory.NumberField.Cyclotomic.Basic

Goal state before:
pp: case refine_1
p k : ℕ
hp : Fact (Nat.Prime p)
hζ : IsPrimitiveRoot (zeta (p ^ k) ℚ (CyclotomicField (p ^ k) ℚ)) (p ^ k)
x : CyclotomicField (p ^ k) ℚ
h : IsIntegral ℤ x
⊢ x ∈ adjoin ℤ {b | b ^ p ^ k = 1}

Tactic:
obtain ⟨y, rfl⟩ := (isIntegralClosure_adjoin_singleton_of_prime_pow hζ).isIntegral_iff.1 h

Goal state after:
case refine_1
p k : ℕ
hp : Fact (Nat.Prime p)
hζ : IsPrimitiveRoot (zeta (p ^ k) ℚ (CyclotomicField (p ^ k) ℚ)) (p ^ k)
y : ↥ℤ[zeta (p ^ k) ℚ (CyclotomicField (p ^ k) ℚ)]
h : IsIntegral ℤ ((algebraMap (↥ℤ[zeta (p ^ k) ℚ (CyclotomicField (p ^ k) ℚ)]) (CyclotomicField (p ^ k) ℚ)) y)
⊢ (algebraMap (↥ℤ[zeta (p ^ k) ℚ (CyclotomicField (p ^ k) ℚ)]) (CyclotomicField (p ^ k) ℚ)) y ∈
    adjoin ℤ {b | b ^ p ^ k = 1}
Module: Mathlib.NumberTheory.NumberField.Cyclotomic.Basic

Goal state before:
pp: K : Type u
inst✝² : Field K
ζ : K
inst✝¹ : CharZero K
inst✝ : IsCyclotomicExtension {2} ℚ K
hζ : IsPrimitiveRoot ζ 2
⊢ (Algebra.norm ℤ) (hζ.toInteger - 1) = -2

Tactic:
by
  rw [show 2 = (2 ^ (0 + 1)) by norm_num] at hζ
  simpa using hζ.norm_toInteger_pow_sub_one_of_two

Goal state after:
Module: Mathlib.NumberTheory.NumberField.Cyclotomic.Basic

Goal state before:
pp: n : ℕ
hn : 2 ≤ n
K : Type u_1
inst✝¹ : Field K
inst✝ : NumberField K
ζ : K
p : ℕ
hF : Fact (Nat.Prime p)
hζ : IsPrimitiveRoot ζ n
hp : ↑p ∣ (Algebra.norm ℤ) (hζ.toInteger - 1)
this : NeZero n
⊢ ∃ μ,
    ∃ (_ : IsCyclotomicExtension {n} ℚ ↥ℚ⟮ζ⟯) (hμ : IsPrimitiveRoot μ n),
      (Algebra.norm ℤ) (hζ.toInteger - 1) = (Algebra.norm ℤ) (hμ.toInteger - 1) ^ Module.finrank (↥ℚ⟮ζ⟯) K

Tactic:
by
    refine ⟨IntermediateField.AdjoinSimple.gen ℚ ζ,
      intermediateField_adjoin_isCyclotomicExtension ℚ hζ, coe_submonoidClass_iff.mp hζ, ?_⟩
    have : NumberField ℚ⟮ζ⟯ := of_intermediateField _
    rw [norm_eq_iff ℤ (Sₘ := K) (Rₘ := ℚ) le_rfl, map_sub, map_one, RingOfIntegers.map_mk,
      show ζ - 1 = algebraMap ℚ⟮ζ⟯ K (IntermediateField.AdjoinSimple.gen ℚ ζ - 1) by rfl,
      ← norm_norm (S := ℚ⟮ζ⟯), Algebra.norm_algebraMap, map_pow, map_pow, ← norm_localization ℤ
      (nonZeroDivisors ℤ) (Sₘ := ℚ⟮ζ⟯), map_sub (algebraMap _ _), RingOfIntegers.map_mk, map_one]

Goal state after:
Module: Mathlib.RingTheory.DedekindDomain.Different

Goal state before:
pp: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝¹⁸ : CommRing A
inst✝¹⁷ : Field K
inst✝¹⁶ : CommRing B
inst✝¹⁵ : Field L
inst✝¹⁴ : Algebra A K
inst✝¹³ : Algebra B L
inst✝¹² : Algebra A B
inst✝¹¹ : Algebra K L
inst✝¹⁰ : Algebra A L
inst✝⁹ : IsScalarTower A K L
inst✝⁸ : IsScalarTower A B L
inst✝⁷ : IsDomain A
inst✝⁶ : IsFractionRing A K
inst✝⁵ : FiniteDimensional K L
inst✝⁴ : Algebra.IsSeparable K L
inst✝³ : IsIntegralClosure B A L
inst✝² : IsFractionRing B L
inst✝¹ : IsIntegrallyClosed A
inst✝ : IsDedekindDomain B
I : FractionalIdeal B⁰ L
hI : I ≠ 0
⊢ ↑(dual A K I) = (↑I)ᵛ

Tactic:
rw [dual, dif_neg hI, coe_mk]

Goal state after:
Module: Mathlib.RingTheory.DedekindDomain.Different

Goal state before:
pp: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝¹⁸ : CommRing A
inst✝¹⁷ : Field K
inst✝¹⁶ : CommRing B
inst✝¹⁵ : Field L
inst✝¹⁴ : Algebra A K
inst✝¹³ : Algebra B L
inst✝¹² : Algebra A B
inst✝¹¹ : Algebra K L
inst✝¹⁰ : Algebra A L
inst✝⁹ : IsScalarTower A K L
inst✝⁸ : IsScalarTower A B L
inst✝⁷ : IsDomain A
inst✝⁶ : IsFractionRing A K
inst✝⁵ : FiniteDimensional K L
inst✝⁴ : Algebra.IsSeparable K L
inst✝³ : IsIntegralClosure B A L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : IsTorsionFree A B
x : B
hx : K[(algebraMap B L) x] = ⊤
hAx : IsIntegral A x
this : IsFractionRing B L
⊢ (fun I ↦ ↑I) ↑(conductor A x) =
    (fun I ↦ ↑I)
      (FractionalIdeal.spanSingleton B⁰ ((algebraMap B L) ((aeval x) (derivative (minpoly A x)))) *
        FractionalIdeal.dual A K 1)

Tactic:
simp only [FractionalIdeal.coe_coeIdeal, FractionalIdeal.coe_mul,
    FractionalIdeal.coe_spanSingleton, Submodule.span_singleton_mul]

Goal state after:
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝¹⁸ : CommRing A
inst✝¹⁷ : Field K
inst✝¹⁶ : CommRing B
inst✝¹⁵ : Field L
inst✝¹⁴ : Algebra A K
inst✝¹³ : Algebra B L
inst✝¹² : Algebra A B
inst✝¹¹ : Algebra K L
inst✝¹⁰ : Algebra A L
inst✝⁹ : IsScalarTower A K L
inst✝⁸ : IsScalarTower A B L
inst✝⁷ : IsDomain A
inst✝⁶ : IsFractionRing A K
inst✝⁵ : FiniteDimensional K L
inst✝⁴ : Algebra.IsSeparable K L
inst✝³ : IsIntegralClosure B A L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : IsTorsionFree A B
x : B
hx : K[(algebraMap B L) x] = ⊤
hAx : IsIntegral A x
this : IsFractionRing B L
⊢ coeSubmodule L (conductor A x) =
    (algebraMap B L) ((aeval x) (derivative (minpoly A x))) • ↑(FractionalIdeal.dual A K 1)
Module: Mathlib.NumberTheory.NumberField.Units.DirichletTheorem

Goal state before:
pp: K : Type u_1
inst✝¹ : Field K
inst✝ : NumberField K
x : (𝓞 K)ˣ
w : { w // w ≠ w₀ }
r : NNReal
h : ↑(univ.sup fun b ↦ ‖(logEmbedding K) x b‖₊) ≤ ↑r
⊢ |(logEmbedding K) (Additive.ofMul x) w| ≤ ↑r

Tactic:
NNReal.coe_le_coe,

Goal state after:
K : Type u_1
inst✝¹ : Field K
inst✝ : NumberField K
x : (𝓞 K)ˣ
w : { w // w ≠ w₀ }
r : NNReal
h : (univ.sup fun b ↦ ‖(logEmbedding K) x b‖₊) ≤ r
⊢ |(logEmbedding K) (Additive.ofMul x) w| ≤ ↑r
Module: Mathlib.NumberTheory.NumberField.Cyclotomic.Basic

Goal state before:
pp: case inl
n : ℕ
K : Type u
inst✝² : Field K
inst✝¹ : NeZero n
inst✝ : NumberField K
hK : IsCyclotomicExtension {n} ℚ K
hζ : IsPrimitiveRoot (zeta n ℚ K) n
μ : ↥(torsion K)
hμ : IsPrimitiveRoot ((algebraMap (𝓞 K) K) ↑↑μ) (torsionOrder K)
h :
  IsPrimitiveRoot
    (zeta n ℚ K ^ (n / n.factorizationLCMLeft (torsionOrder K)) *
      (algebraMap (𝓞 K) K) ↑↑μ ^ (torsionOrder K / n.factorizationLCMRight (torsionOrder K)))
    (n.lcm (torsionOrder K))
this✝ : NeZero (n.lcm (torsionOrder K))
this : IsCyclotomicExtension {n.lcm (torsionOrder K)} ℚ K
h_main : φ n = φ (n.lcm (torsionOrder K))
hn : Even n
⊢ torsionOrder K = if Even n then n else 2 * n

pp: case inr
n : ℕ
K : Type u
inst✝² : Field K
inst✝¹ : NeZero n
inst✝ : NumberField K
hK : IsCyclotomicExtension {n} ℚ K
hζ : IsPrimitiveRoot (zeta n ℚ K) n
μ : ↥(torsion K)
hμ : IsPrimitiveRoot ((algebraMap (𝓞 K) K) ↑↑μ) (torsionOrder K)
h :
  IsPrimitiveRoot
    (zeta n ℚ K ^ (n / n.factorizationLCMLeft (torsionOrder K)) *
      (algebraMap (𝓞 K) K) ↑↑μ ^ (torsionOrder K / n.factorizationLCMRight (torsionOrder K)))
    (n.lcm (torsionOrder K))
this✝ : NeZero (n.lcm (torsionOrder K))
this : IsCyclotomicExtension {n.lcm (torsionOrder K)} ℚ K
h_main : φ n = φ (n.lcm (torsionOrder K))
hn : Odd n
⊢ torsionOrder K = if Even n then n else 2 * n

Tactic:
· rw [if_pos hn]
    apply dvd_antisymm
    · have := hn.eq_of_totient_eq_totient (Nat.dvd_lcm_left _ _) h_main
      rwa [eq_comm, Nat.lcm_eq_left_iff_dvd] at this
    · exact dvd_torsionOrder_of_isPrimitiveRoot hζ

Goal state after:
case inr
n : ℕ
K : Type u
inst✝² : Field K
inst✝¹ : NeZero n
inst✝ : NumberField K
hK : IsCyclotomicExtension {n} ℚ K
hζ : IsPrimitiveRoot (zeta n ℚ K) n
μ : ↥(torsion K)
hμ : IsPrimitiveRoot ((algebraMap (𝓞 K) K) ↑↑μ) (torsionOrder K)
h :
  IsPrimitiveRoot
    (zeta n ℚ K ^ (n / n.factorizationLCMLeft (torsionOrder K)) *
      (algebraMap (𝓞 K) K) ↑↑μ ^ (torsionOrder K / n.factorizationLCMRight (torsionOrder K)))
    (n.lcm (torsionOrder K))
this✝ : NeZero (n.lcm (torsionOrder K))
this : IsCyclotomicExtension {n.lcm (torsionOrder K)} ℚ K
h_main : φ n = φ (n.lcm (torsionOrder K))
hn : Odd n
⊢ torsionOrder K = if Even n then n else 2 * n
Module: Mathlib.NumberTheory.NumberField.Units.DirichletTheorem

Goal state before:
pp: case succ
K : Type u_1
inst✝¹ : Field K
inst✝ : NumberField K
w₁ : InfinitePlace K
B : ℕ
hB : minkowskiBound K 1 < ↑(convexBodyLTFactor K) * ↑B
n : ℕ
⊢ ↑|(Algebra.norm ℤ) ↑(seq K w₁ hB (n + 1))| ≤ ↑B

Tactic:
Int.cast_abs,

Goal state after:
case succ
K : Type u_1
inst✝¹ : Field K
inst✝ : NumberField K
w₁ : InfinitePlace K
B : ℕ
hB : minkowskiBound K 1 < ↑(convexBodyLTFactor K) * ↑B
n : ℕ
⊢ |↑((Algebra.norm ℤ) ↑(seq K w₁ hB (n + 1)))| ≤ ↑B
Module: Mathlib.NumberTheory.NumberField.Units.DirichletTheorem

Goal state before:
pp: case refine_2
K : Type u_1
inst✝¹ : Field K
inst✝ : NumberField K
B : Basis { w // w ≠ w₀ } ℝ ({ w // w ≠ w₀ } → ℝ) := Pi.basisFun ℝ { w // w ≠ w₀ }
v : { w // w ≠ w₀ } → logSpace K := fun w ↦ (logEmbedding K) (Additive.ofMul ⋯.choose)
w x : { w // w ≠ w₀ }
hx : x ∈ univ.erase w
⊢ ↑x ≠ ↑w

Tactic:
exact Subtype.ext_iff.not.mp (ne_of_mem_erase hx)

Goal state after: