mathlib-initiative/mathlib-tactics huggingface dataset:
Module: Mathlib.Algebra.Lie.Weights.Chain

Goal state before:
pp: R : Type u_1
L : Type u_2
inst✝¹¹ : CommRing R
inst✝¹⁰ : LieRing L
inst✝⁹ : LieAlgebra R L
M : Type u_3
inst✝⁸ : AddCommGroup M
inst✝⁷ : Module R M
inst✝⁶ : LieRingModule L M
inst✝⁵ : LieModule R L M
inst✝⁴ : LieRing.IsNilpotent L
inst✝³ : IsAddTorsionFree R
inst✝² : IsDomain R
inst✝¹ : IsTorsionFree R M
inst✝ : IsNoetherian R M
α : L → R
β : Weight R L M
hα : α ≠ 0
⊢ genWeightSpace M (-((↑(chainBotCoeff α β) + 1) • α) + ⇑β) = ⊥

Tactic:
← smul_neg,

Goal state after:
R : Type u_1
L : Type u_2
inst✝¹¹ : CommRing R
inst✝¹⁰ : LieRing L
inst✝⁹ : LieAlgebra R L
M : Type u_3
inst✝⁸ : AddCommGroup M
inst✝⁷ : Module R M
inst✝⁶ : LieRingModule L M
inst✝⁵ : LieModule R L M
inst✝⁴ : LieRing.IsNilpotent L
inst✝³ : IsAddTorsionFree R
inst✝² : IsDomain R
inst✝¹ : IsTorsionFree R M
inst✝ : IsNoetherian R M
α : L → R
β : Weight R L M
hα : α ≠ 0
⊢ genWeightSpace M ((↑(chainBotCoeff α β) + 1) • -α + ⇑β) = ⊥
Module: Mathlib.Algebra.Lie.Weights.Chain

Goal state before:
pp: case negSucc
R : Type u_1
L : Type u_2
inst✝¹¹ : CommRing R
inst✝¹⁰ : LieRing L
inst✝⁹ : LieAlgebra R L
M : Type u_3
inst✝⁸ : AddCommGroup M
inst✝⁷ : Module R M
inst✝⁶ : LieRingModule L M
inst✝⁵ : LieModule R L M
inst✝⁴ : LieRing.IsNilpotent L
inst✝³ : IsAddTorsionFree R
inst✝² : IsDomain R
inst✝¹ : IsTorsionFree R M
inst✝ : IsNoetherian R M
α : L → R
β : Weight R L M
n : ℕ
hn' : Int.negSucc n ≤ ↑(chainTopCoeff α β)
hn : n.succ ≤ chainBotCoeff α β
⊢ genWeightSpace M (-(↑n.succ • α) + ⇑β) ≠ ⊥

Tactic:
← smul_neg,

Goal state after:
case negSucc
R : Type u_1
L : Type u_2
inst✝¹¹ : CommRing R
inst✝¹⁰ : LieRing L
inst✝⁹ : LieAlgebra R L
M : Type u_3
inst✝⁸ : AddCommGroup M
inst✝⁷ : Module R M
inst✝⁶ : LieRingModule L M
inst✝⁵ : LieModule R L M
inst✝⁴ : LieRing.IsNilpotent L
inst✝³ : IsAddTorsionFree R
inst✝² : IsDomain R
inst✝¹ : IsTorsionFree R M
inst✝ : IsNoetherian R M
α : L → R
β : Weight R L M
n : ℕ
hn' : Int.negSucc n ≤ ↑(chainTopCoeff α β)
hn : n.succ ≤ chainBotCoeff α β
⊢ genWeightSpace M (↑n.succ • -α + ⇑β) ≠ ⊥
Module: Mathlib.Algebra.Polynomial.Sequence

Goal state before:
pp: case pos
R : Type u_1
inst✝ : Ring R
S : Sequence R
m : ℕ
hCoeff : ∀ i < m, IsUnit (↑S i).leadingCoeff
a✝ : Nontrivial R
n : ℕ
ih : ∀ m_1 < n, ∀ ⦃P : R[X]⦄, P ∈ degreeLT R m → P.natDegree = m_1 → P ∈ span R (↑S '' Set.Iio m)
P : R[X]
hP : P ∈ degreeLT R m
hp : P.natDegree = n
p_ne_zero : P ≠ 0
hn : n < m
u : R
leftinv : (↑S n).leadingCoeff * u = 1
rightinv : u * (↑S n).leadingCoeff = 1
head : R[X] := P.leadingCoeff • u • ↑S n
tail : R[X] := P - head
head_mem_span : head ∈ span R (↑S '' Set.Iio m)
tail_eq_zero : tail = 0
⊢ P ∈ span R (↑S '' Set.Iio m)

pp: case neg
R : Type u_1
inst✝ : Ring R
S : Sequence R
m : ℕ
hCoeff : ∀ i < m, IsUnit (↑S i).leadingCoeff
a✝ : Nontrivial R
n : ℕ
ih : ∀ m_1 < n, ∀ ⦃P : R[X]⦄, P ∈ degreeLT R m → P.natDegree = m_1 → P ∈ span R (↑S '' Set.Iio m)
P : R[X]
hP : P ∈ degreeLT R m
hp : P.natDegree = n
p_ne_zero : P ≠ 0
hn : n < m
u : R
leftinv : (↑S n).leadingCoeff * u = 1
rightinv : u * (↑S n).leadingCoeff = 1
head : R[X] := P.leadingCoeff • u • ↑S n
tail : R[X] := P - head
head_mem_span : head ∈ span R (↑S '' Set.Iio m)
tail_eq_zero : ¬tail = 0
⊢ P ∈ span R (↑S '' Set.Iio m)

Tactic:
· simp [head_mem_span, sub_eq_iff_eq_add.mp tail_eq_zero]

Goal state after:
case neg
R : Type u_1
inst✝ : Ring R
S : Sequence R
m : ℕ
hCoeff : ∀ i < m, IsUnit (↑S i).leadingCoeff
a✝ : Nontrivial R
n : ℕ
ih : ∀ m_1 < n, ∀ ⦃P : R[X]⦄, P ∈ degreeLT R m → P.natDegree = m_1 → P ∈ span R (↑S '' Set.Iio m)
P : R[X]
hP : P ∈ degreeLT R m
hp : P.natDegree = n
p_ne_zero : P ≠ 0
hn : n < m
u : R
leftinv : (↑S n).leadingCoeff * u = 1
rightinv : u * (↑S n).leadingCoeff = 1
head : R[X] := P.leadingCoeff • u • ↑S n
tail : R[X] := P - head
head_mem_span : head ∈ span R (↑S '' Set.Iio m)
tail_eq_zero : ¬tail = 0
⊢ P ∈ span R (↑S '' Set.Iio m)
Module: Mathlib.Algebra.Polynomial.Sequence

Goal state before:
pp: R : Type u_1
inst✝ : Ring R
S : Sequence R
m : ℕ
hCoeff : ∀ i < m, IsUnit (↑S i).leadingCoeff
a✝ : Nontrivial R
n : ℕ
ih : ∀ m_1 < n, ∀ ⦃P : R[X]⦄, P ∈ degreeLT R m → P.natDegree = m_1 → P ∈ span R (↑S '' Set.Iio m)
P : R[X]
hP : P ∈ degreeLT R m
hp : P.natDegree = n
hn : n < m
u : R
head : R[X] := P.leadingCoeff • u • ↑S n
tail : R[X] := P - head
head_mem_span : head ∈ span R (↑S '' Set.Iio m)
isRightRegular_smul_leadingCoeff : IsRightRegular (u • ↑S n).leadingCoeff
u_degree_same : (u • ↑S n).degree = (↑S n).degree
head_degree_eq_natDegree : head.degree = ↑head.natDegree
p_ne_zero : ¬P = 0
leftinv : (↑S n).leadingCoeff * u = 1
rightinv : u * (↑S n).leadingCoeff = 1
tail_eq_zero : ¬tail = 0
head_degree_eq : P.natDegree = head.natDegree
⊢ P.leadingCoeff = (P.leadingCoeff • u • ↑S n).coeff (↑S n).natDegree

Tactic:
coeff_smul,

Goal state after:
R : Type u_1
inst✝ : Ring R
S : Sequence R
m : ℕ
hCoeff : ∀ i < m, IsUnit (↑S i).leadingCoeff
a✝ : Nontrivial R
n : ℕ
ih : ∀ m_1 < n, ∀ ⦃P : R[X]⦄, P ∈ degreeLT R m → P.natDegree = m_1 → P ∈ span R (↑S '' Set.Iio m)
P : R[X]
hP : P ∈ degreeLT R m
hp : P.natDegree = n
hn : n < m
u : R
head : R[X] := P.leadingCoeff • u • ↑S n
tail : R[X] := P - head
head_mem_span : head ∈ span R (↑S '' Set.Iio m)
isRightRegular_smul_leadingCoeff : IsRightRegular (u • ↑S n).leadingCoeff
u_degree_same : (u • ↑S n).degree = (↑S n).degree
head_degree_eq_natDegree : head.degree = ↑head.natDegree
p_ne_zero : ¬P = 0
leftinv : (↑S n).leadingCoeff * u = 1
rightinv : u * (↑S n).leadingCoeff = 1
tail_eq_zero : ¬tail = 0
head_degree_eq : P.natDegree = head.natDegree
⊢ P.leadingCoeff = P.leadingCoeff • (u • ↑S n).coeff (↑S n).natDegree
Module: Mathlib.Algebra.Polynomial.Sequence

Goal state before:
pp: R : Type u_1
inst✝ : Ring R
S : Sequence R
m : ℕ
hCoeff : ∀ i < m, IsUnit (↑S i).leadingCoeff
a✝ : Nontrivial R
n : ℕ
ih : ∀ m_1 < n, ∀ ⦃P : R[X]⦄, P ∈ degreeLT R m → P.natDegree = m_1 → P ∈ span R (↑S '' Set.Iio m)
P : R[X]
hP : P ∈ degreeLT R m
hp : P.natDegree = n
hn : n < m
u : R
head : R[X] := P.leadingCoeff • u • ↑S n
tail : R[X] := P - head
head_mem_span : head ∈ span R (↑S '' Set.Iio m)
isRightRegular_smul_leadingCoeff : IsRightRegular (u • ↑S n).leadingCoeff
u_degree_same : (u • ↑S n).degree = (↑S n).degree
head_degree_eq_natDegree : head.degree = ↑head.natDegree
p_ne_zero : ¬P = 0
leftinv : (↑S n).leadingCoeff * u = 1
rightinv : u * (↑S n).leadingCoeff = 1
tail_eq_zero : ¬tail = 0
head_degree_eq : P.natDegree = head.natDegree
⊢ P.leadingCoeff = P.leadingCoeff • (u • ↑S n).coeff (↑S n).natDegree

Tactic:
coeff_smul,

Goal state after:
R : Type u_1
inst✝ : Ring R
S : Sequence R
m : ℕ
hCoeff : ∀ i < m, IsUnit (↑S i).leadingCoeff
a✝ : Nontrivial R
n : ℕ
ih : ∀ m_1 < n, ∀ ⦃P : R[X]⦄, P ∈ degreeLT R m → P.natDegree = m_1 → P ∈ span R (↑S '' Set.Iio m)
P : R[X]
hP : P ∈ degreeLT R m
hp : P.natDegree = n
hn : n < m
u : R
head : R[X] := P.leadingCoeff • u • ↑S n
tail : R[X] := P - head
head_mem_span : head ∈ span R (↑S '' Set.Iio m)
isRightRegular_smul_leadingCoeff : IsRightRegular (u • ↑S n).leadingCoeff
u_degree_same : (u • ↑S n).degree = (↑S n).degree
head_degree_eq_natDegree : head.degree = ↑head.natDegree
p_ne_zero : ¬P = 0
leftinv : (↑S n).leadingCoeff * u = 1
rightinv : u * (↑S n).leadingCoeff = 1
tail_eq_zero : ¬tail = 0
head_degree_eq : P.natDegree = head.natDegree
⊢ P.leadingCoeff = P.leadingCoeff • u • (↑S n).coeff (↑S n).natDegree
Module: Mathlib.Algebra.Lie.Weights.Killing

Goal state before:
pp: K : Type u_2
L : Type u_3
inst✝⁵ : LieRing L
inst✝⁴ : Field K
inst✝³ : LieAlgebra K L
inst✝² : FiniteDimensional K L
H : LieSubalgebra K L
inst✝¹ : H.IsCartanSubalgebra
inst✝ : IsKilling K L
α : Weight K (↥H) L
x : ↥H
this : ((cartanEquivDual H) ((cartanEquivDual H).symm (Weight.toLinear K (↥H) L α))) x = α x
⊢ ((traceForm K (↥H) L)
        (2 •
          (α ((cartanEquivDual H).symm (Weight.toLinear K (↥H) L α)))⁻¹ •
            (cartanEquivDual H).symm (Weight.toLinear K (↥H) L α)))
      x =
    2 • (α ((cartanEquivDual H).symm (Weight.toLinear K (↥H) L α)))⁻¹ • α x

Tactic:
map_nsmul,

Goal state after:
K : Type u_2
L : Type u_3
inst✝⁵ : LieRing L
inst✝⁴ : Field K
inst✝³ : LieAlgebra K L
inst✝² : FiniteDimensional K L
H : LieSubalgebra K L
inst✝¹ : H.IsCartanSubalgebra
inst✝ : IsKilling K L
α : Weight K (↥H) L
x : ↥H
this : ((cartanEquivDual H) ((cartanEquivDual H).symm (Weight.toLinear K (↥H) L α))) x = α x
⊢ (2 •
        (traceForm K (↥H) L)
          ((α ((cartanEquivDual H).symm (Weight.toLinear K (↥H) L α)))⁻¹ •
            (cartanEquivDual H).symm (Weight.toLinear K (↥H) L α)))
      x =
    2 • (α ((cartanEquivDual H).symm (Weight.toLinear K (↥H) L α)))⁻¹ • α x
Module: Mathlib.Algebra.Lie.Weights.Killing

Goal state before:
pp: K : Type u_2
L : Type u_3
inst✝⁷ : LieRing L
inst✝⁶ : Field K
inst✝⁵ : LieAlgebra K L
inst✝⁴ : FiniteDimensional K L
H : LieSubalgebra K L
inst✝³ : H.IsCartanSubalgebra
inst✝² : IsKilling K L
inst✝¹ : IsTriangularizable K (↥H) L
inst✝ : PerfectField K
x : L
hx : x ∈ H
N S : End K L
hN : _root_.IsNilpotent ((ad K L) x - S)
hS : S.IsSemisimple
hSN : (ad K L) x = N + S
hS₀ : Commute ((ad K L) x) S
x' : ↥H := ⟨x, hx⟩
α : ↥H → K
y : L
hy : y ∈ ((ad K L) x).maxGenEigenspace (α x')
⊢ S y = α x' • y

Tactic:
maxGenEigenspace_eq

Goal state after:
K : Type u_2
L : Type u_3
inst✝⁷ : LieRing L
inst✝⁶ : Field K
inst✝⁵ : LieAlgebra K L
inst✝⁴ : FiniteDimensional K L
H : LieSubalgebra K L
inst✝³ : H.IsCartanSubalgebra
inst✝² : IsKilling K L
inst✝¹ : IsTriangularizable K (↥H) L
inst✝ : PerfectField K
x : L
hx : x ∈ H
N S : End K L
hN : _root_.IsNilpotent ((ad K L) x - S)
hS : S.IsSemisimple
hSN : (ad K L) x = N + S
hS₀ : Commute ((ad K L) x) S
x' : ↥H := ⟨x, hx⟩
α : ↥H → K
y : L
hy : y ∈ (((ad K L) x).genEigenspace (α x')) ↑(((ad K L) x).maxGenEigenspaceIndex (α x'))
⊢ S y = α x' • y
Module: Mathlib.Algebra.Lie.TraceForm

Goal state before:
pp: K : Type u_2
L : Type u_3
M : Type u_4
inst✝¹⁰ : LieRing L
inst✝⁹ : AddCommGroup M
inst✝⁸ : LieRingModule L M
inst✝⁷ : Field K
inst✝⁶ : LieAlgebra K L
inst✝⁵ : Module K M
inst✝⁴ : LieModule K L M
inst✝³ : FiniteDimensional K M
inst✝² : LieRing.IsNilpotent L
inst✝¹ : LinearWeights K L M
inst✝ : IsTriangularizable K L M
x : L
χ : Weight K L M
x✝ : χ ∈ Finset.univ
⊢ ↑(finrank K ↥(genWeightSpace M ⇑χ)) • χ x • Weight.toLinear K L M χ ∈ span K (range (Weight.toLinear K L M))

Tactic:
exact Submodule.smul_mem _ _ <| Submodule.smul_mem _ _ <| subset_span <| mem_range_self χ

Goal state after:
Module: Mathlib.Algebra.Lie.Weights.Killing

Goal state before:
pp: case refine_1
K : Type u_2
L : Type u_3
inst✝⁷ : LieRing L
inst✝⁶ : Field K
inst✝⁵ : LieAlgebra K L
inst✝⁴ : FiniteDimensional K L
H : LieSubalgebra K L
inst✝³ : H.IsCartanSubalgebra
inst✝² : IsKilling K L
inst✝¹ : IsTriangularizable K (↥H) L
inst✝ : CharZero K
α : Weight K (↥H) L
hα : coroot α = 0
contra : ¬α.IsZero
⊢ False

Tactic:
simpa [hα, ← α.coe_coe, map_zero] using root_apply_coroot contra

Goal state after:
Module: Mathlib.RingTheory.Polynomial.Chebyshev

Goal state before:
pp: case more
R : Type u_1
inst✝² : CommRing R
inst✝¹ : IsDomain R
inst✝ : NeZero 2
this : leadingCoeff 2 = 2
n : ℕ
ih1 : (U R ↑n).leadingCoeff = 2 ^ n
ih2 : (U R (↑n + 1)).leadingCoeff = 2 ^ (n + 1)
⊢ 2 * 1 * 2 ^ (n + 1) = 2 ^ (n + 2)

Tactic:
norm_cast; rw [pow_add, pow_add]; ring_nf

Goal state after:
Module: Mathlib.LinearAlgebra.Reflection

Goal state before:
pp: R : Type u_1
M : Type u_2
inst✝⁵ : CommRing R
inst✝⁴ : AddCommGroup M
inst✝³ : Module R M
inst✝² : CharZero R
inst✝¹ : IsDomain R
inst✝ : IsTorsionFree R M
x : M
Φ : Set M
hΦ₁ : Φ.Finite
hx : x ∈ span R Φ
f g : Dual R M
hf₁ : f x = 2
hf₂ : MapsTo (⇑(preReflection x f)) Φ Φ
hg₁ : g x = 2
hg₂ : MapsTo (⇑(preReflection x g)) Φ Φ
⊢ (span R Φ).subtype.dualMap f = (span R Φ).subtype.dualMap g

Tactic:
by
  set Φ' : Set (span R Φ) := range (inclusion <| Submodule.subset_span (R := R) (s := Φ))
  rw [← finite_coe_iff] at hΦ₁
  have hΦ'₁ : Φ'.Finite := finite_range (inclusion Submodule.subset_span)
  have hΦ'₂ : span R Φ' = ⊤ := by
    simp only [Φ']
    rw [range_inclusion]
    simp
  let x' : span R Φ := ⟨x, hx⟩
  have : ∀ {F : Dual R M}, MapsTo (preReflection x F) Φ Φ →
      MapsTo (preReflection x' ((span R Φ).subtype.dualMap F)) Φ' Φ' := by
    intro F hF ⟨y, hy⟩ hy'
    simp only [Φ'] at hy' ⊢
    rw [range_inclusion] at hy'
    simp only [SetLike.coe_sort_coe, mem_ofPred_eq] at hy' ⊢
    rw [range_inclusion]
    exact hF hy'
  exact eq_of_preReflection_mapsTo hΦ'₁ hΦ'₂ hf₁ (this hf₂) hg₁ (this hg₂)

Goal state after:
Module: Mathlib.LinearAlgebra.PerfectPairing.Restrict

Goal state before:
pp: R : Type u_1
M : Type u_2
N : Type u_3
inst✝⁹ : CommRing R
inst✝⁸ : AddCommGroup M
inst✝⁷ : Module R M
inst✝⁶ : AddCommGroup N
inst✝⁵ : Module R N
p : M →ₗ[R] N →ₗ[R] R
inst✝⁴ : p.IsPerfPair
M' : Type u_4
N' : Type u_5
inst✝³ : AddCommGroup M'
inst✝² : Module R M'
inst✝¹ : AddCommGroup N'
inst✝ : Module R N'
i : M' →ₗ[R] M
j : N' →ₗ[R] N
hi : Injective ⇑i
hj : Injective ⇑j
hij : p.IsPerfectCompl i.range j.range
m : M'
hm : m ∈ (p.compl₁₂ i j).ker
⊢ ∀ w ∈ j.range, (p.toPerfPair (i m)) w = 0

Tactic:
rintro - ⟨n, rfl⟩

Goal state after:
R : Type u_1
M : Type u_2
N : Type u_3
inst✝⁹ : CommRing R
inst✝⁸ : AddCommGroup M
inst✝⁷ : Module R M
inst✝⁶ : AddCommGroup N
inst✝⁵ : Module R N
p : M →ₗ[R] N →ₗ[R] R
inst✝⁴ : p.IsPerfPair
M' : Type u_4
N' : Type u_5
inst✝³ : AddCommGroup M'
inst✝² : Module R M'
inst✝¹ : AddCommGroup N'
inst✝ : Module R N'
i : M' →ₗ[R] M
j : N' →ₗ[R] N
hi : Injective ⇑i
hj : Injective ⇑j
hij : p.IsPerfectCompl i.range j.range
m : M'
hm : m ∈ (p.compl₁₂ i j).ker
n : N'
⊢ (p.toPerfPair (i m)) (j n) = 0
Module: Mathlib.LinearAlgebra.Reflection

Goal state before:
pp: R : Type u_1
M : Type u_2
inst✝³ : CommRing R
inst✝² : AddCommGroup M
inst✝¹ : Module R M
ι : Type u_3
inst✝ : IsAddTorsionFree M
r : ι ↪ M
c : ι → Dual R M
hfin : (range ⇑r).Finite
h_two : ∀ (i : ι), (c i) (r i) = 2
h_mapsTo : ∀ (i : ι), MapsTo (⇑(preReflection (r i) (c i))) (range ⇑r) (range ⇑r)
i j : ι
hij : (span R (range ⇑r)).subtype.dualMap (c i) = (span R (range ⇑r)).subtype.dualMap (c j)
this : ∀ (k : ι), (c i) (r k) = (c j) (r k)
⊢ (c i) (r j) = 2

Tactic:
rw [this, h_two]

Goal state after:
Module: Mathlib.RingTheory.Localization.NumDen

Goal state before:
pp: A : Type u_1
inst✝⁵ : CommRing A
inst✝⁴ : IsDomain A
inst✝³ : UniqueFactorizationMonoid A
K : Type u_2
inst✝² : Field K
inst✝¹ : Algebra A K
inst✝ : IsFractionRing A K
x : K
a' b' c' : A
no_factor : IsRelPrime a' b'
b_nonzero : c' * b' ∈ nonZeroDivisors A
left✝ : c' ∈ nonZeroDivisors A
b'_nonzero : b' ∈ nonZeroDivisors A
hab : (algebraMap A K) c' * (algebraMap A K) a' = (algebraMap A K) c' * (algebraMap A K) b' * x
⊢ (algebraMap A K) c' * ((algebraMap A K) b' * mk' K a' ⟨b', b'_nonzero⟩) = (algebraMap A K) c' * (algebraMap A K) a'

Tactic:
mk'_spec' _ a' ⟨b', b'_nonzero⟩

Goal state after:
A : Type u_1
inst✝⁵ : CommRing A
inst✝⁴ : IsDomain A
inst✝³ : UniqueFactorizationMonoid A
K : Type u_2
inst✝² : Field K
inst✝¹ : Algebra A K
inst✝ : IsFractionRing A K
x : K
a' b' c' : A
no_factor : IsRelPrime a' b'
b_nonzero : c' * b' ∈ nonZeroDivisors A
left✝ : c' ∈ nonZeroDivisors A
b'_nonzero : b' ∈ nonZeroDivisors A
hab : (algebraMap A K) c' * (algebraMap A K) a' = (algebraMap A K) c' * (algebraMap A K) b' * x
⊢ (algebraMap A K) c' * (algebraMap A K) a' = (algebraMap A K) c' * (algebraMap A K) a'
Module: Mathlib.RingTheory.DedekindDomain.Basic

Goal state before:
pp: R : Type u_1
A : Type u_2
inst✝⁷ : CommRing R
inst✝⁶ : CommRing A
inst✝⁵ : IsLocalRing A
inst✝⁴ : IsDedekindDomain A
inst✝³ : Algebra R A
inst✝² : FaithfulSMul R A
inst✝¹ : Module.Finite R A
p : Ideal R
inst✝ : p.IsMaximal
hp0 : p ≠ ⊥
⊢ p.primesOver A = {maximalIdeal A}

Tactic:
by
  have : IsDomain R := .of_faithfulSMul R A
  refine Set.eq_singleton_iff_nonempty_unique_mem.mpr ⟨?_, fun P hP ↦ ?_⟩
  · obtain ⟨w', hmax, hover⟩ := exists_maximal_ideal_liesOver_of_isIntegral (S := A) p
    exact ⟨w', hmax.isPrime, hover⟩
  · exact IsLocalRing.eq_maximalIdeal <| hP.1.isMaximal (Ideal.ne_bot_of_mem_primesOver hp0 hP)

Goal state after:
Module: Mathlib.RingTheory.Valuation.Integers

Goal state before:
pp: case inl
F : Type u
Γ₀ : Type v
inst✝³ : Field F
inst✝² : LinearOrderedCommGroupWithZero Γ₀
v : Valuation F Γ₀
O : Type w
inst✝¹ : CommRing O
inst✝ : Algebra O F
hv : v.Integers O
⊢ ↑(Ideal.span {0}) = {y | v ((algebraMap O F) y) ≤ v ((algebraMap O F) 0)}

Tactic:
simp [Set.singleton_zero, map_eq_zero_iff _ hv.hom_inj]

Goal state after:
Module: Mathlib.RingTheory.Valuation.ValuationRing

Goal state before:
pp: A : Type u
inst✝⁵ : CommRing A
K : Type v
inst✝⁴ : Field K
inst✝³ : Algebra A K
inst✝² : IsDomain A
inst✝¹ : ValuationRing A
inst✝ : IsFractionRing A K
⊢ ∀ (a b c : ValueGroup A K), a * b * c = a * (b * c)

Tactic:
rintro ⟨a⟩ ⟨b⟩ ⟨c⟩

Goal state after:
case mk.mk.mk
A : Type u
inst✝⁵ : CommRing A
K : Type v
inst✝⁴ : Field K
inst✝³ : Algebra A K
inst✝² : IsDomain A
inst✝¹ : ValuationRing A
inst✝ : IsFractionRing A K
a✝ : ValueGroup A K
a : K
b✝ : ValueGroup A K
b : K
c✝ : ValueGroup A K
c : K
⊢ Quot.mk (⇑(MulAction.orbitRel Aˣ K)) a * Quot.mk (⇑(MulAction.orbitRel Aˣ K)) b *
      Quot.mk (⇑(MulAction.orbitRel Aˣ K)) c =
    Quot.mk (⇑(MulAction.orbitRel Aˣ K)) a *
      (Quot.mk (⇑(MulAction.orbitRel Aˣ K)) b * Quot.mk (⇑(MulAction.orbitRel Aˣ K)) c)
Module: Mathlib.RingTheory.Valuation.Integers

Goal state before:
pp: F : Type u
Γ₀ : Type v
inst✝³ : Field F
inst✝² : LinearOrderedCommGroupWithZero Γ₀
v : Valuation F Γ₀
O : Type w
inst✝¹ : CommRing O
inst✝ : Algebra O F
hv : v.Integers O
I : Ideal O
⊢ Submodule.IsPrincipal I ↔ ∃ x, ↑I = {y | v ((algebraMap O F) y) ≤ v ((algebraMap O F) x)}

Tactic:
by
  rw [isPrincipal_iff_exists_isGreatest hv]
  constructor <;> rintro ⟨x, hx⟩
  · obtain ⟨a, ha, rfl⟩ : ∃ a ∈ I, (v ∘ algebraMap O F) a = x := by simpa using hx.left
    refine ⟨a, ?_⟩
    ext b
    simp only [SetLike.mem_coe, mem_ofPred_eq]
    constructor <;> intro h
    · exact hx.right (Set.mem_image_of_mem _ h)
    · rw [le_iff_dvd hv] at h
      exact Ideal.mem_of_dvd I h ha
  · refine ⟨v (algebraMap O F x), Set.mem_image_of_mem _ ?_, ?_⟩
    · simp [hx]
    · simp [hx, mem_upperBounds]

Goal state after:
Module: Mathlib.RingTheory.AdicCompletion.Basic

Goal state before:
pp: R : Type u_1
inst✝⁵ : CommRing R
I : Ideal R
M : Type u_4
inst✝⁴ : AddCommGroup M
inst✝³ : Module R M
N : Type u_5
inst✝² : AddCommGroup N
inst✝¹ : Module R N
inst✝ : IsAdicComplete I N
f : (n : ℕ) → M →ₗ[R] N ⧸ I ^ n • ⊤
h : ∀ {m n : ℕ} (hle : m ≤ n), Submodule.factorPow I N hle ∘ₗ f n = f m
⊢ of I N ∘ₗ lift I f ⋯ = AdicCompletion.lift I f ⋯

Tactic:
ext1; simp

Goal state after:
Module: Mathlib.RingTheory.KrullDimension.Zero

Goal state before:
pp: R : Type u_1
inst✝² : CommSemiring R
inst✝¹ : KrullDimLE 0 R
inst✝ : IsDomain R
⊢ IsField R

Tactic:
by_contra h

Goal state after:
R : Type u_1
inst✝² : CommSemiring R
inst✝¹ : KrullDimLE 0 R
inst✝ : IsDomain R
h : ¬IsField R
⊢ False
Module: Mathlib.RingTheory.DiscreteValuationRing.Basic

Goal state before:
pp: R✝ : Type u
inst✝⁵ : CommRing R✝
inst✝⁴ : IsDomain R✝
inst✝³ : IsDiscreteValuationRing R✝
R : Type u_1
inst✝² : CommRing R
inst✝¹ : IsDomain R
inst✝ : IsDiscreteValuationRing R
I : Ideal R
x : R := generator I
this : ENat.recTopCoe ⊥ (fun n ↦ maximalIdeal R ^ n) ((addVal R) x) = span {x}
⊢ (fun n ↦ ENat.recTopCoe ⊥ (fun n ↦ maximalIdeal R ^ n) (OrderDual.ofDual n))
      ((fun I ↦ OrderDual.toDual ((addVal R) (generator I))) I) =
    I

Tactic:
rwa [Ideal.span_singleton_generator] at this

Goal state after:
Module: Mathlib.RingTheory.Jacobson.Ring

Goal state before:
pp: case refine_2
R : Type u_1
inst✝⁶ : CommRing R
Rₘ : Type u_3
Sₘ : Type u_4
inst✝⁵ : CommRing Rₘ
inst✝⁴ : CommRing Sₘ
P : Ideal R[X]
pX : R[X]
hpX : pX ∈ P
inst✝³ : Algebra (R ⧸ comap C P) Rₘ
inst✝² : IsLocalization.Away (map (Ideal.Quotient.mk (comap C P)) pX).leadingCoeff Rₘ
inst✝¹ : Algebra (R[X] ⧸ P) Sₘ
inst✝ :
  IsLocalization
    (Submonoid.map (quotientMap P C ⋯) (Submonoid.powers (map (Ideal.Quotient.mk (comap C P)) pX).leadingCoeff)) Sₘ
P' : Ideal R := comap C P
M : Submonoid (R ⧸ P') := Submonoid.powers (map (Ideal.Quotient.mk (comap C P)) pX).leadingCoeff
M' : Submonoid (R[X] ⧸ P) :=
  Submonoid.map (quotientMap P C ⋯) (Submonoid.powers (map (Ideal.Quotient.mk (comap C P)) pX).leadingCoeff)
φ : R ⧸ P' →+* R[X] ⧸ P := quotientMap P C ⋯
φ' : Rₘ →+* Sₘ := IsLocalization.map Sₘ φ ⋯
hφ' : φ.comp (Ideal.Quotient.mk P') = (Ideal.Quotient.mk P).comp C
p✝ : Sₘ
q : R[X] ⧸ P
hq : q ∈ M'
p : R[X]
hp : p✝ * (algebraMap (R[X] ⧸ P) Sₘ) q = (algebraMap (R[X] ⧸ P) Sₘ) ((Ideal.Quotient.mk P) p)
⊢ (algebraMap (R[X] ⧸ P) Sₘ) ((Ideal.Quotient.mk P) p) ∈
    Subring.closure (⇑((algebraMap (R[X] ⧸ P) Sₘ).comp (Ideal.Quotient.mk P)) '' insert X {p | p.degree ≤ 0})

Tactic:
rw [← RingHom.comp_apply]

Goal state after:
case refine_2
R : Type u_1
inst✝⁶ : CommRing R
Rₘ : Type u_3
Sₘ : Type u_4
inst✝⁵ : CommRing Rₘ
inst✝⁴ : CommRing Sₘ
P : Ideal R[X]
pX : R[X]
hpX : pX ∈ P
inst✝³ : Algebra (R ⧸ comap C P) Rₘ
inst✝² : IsLocalization.Away (map (Ideal.Quotient.mk (comap C P)) pX).leadingCoeff Rₘ
inst✝¹ : Algebra (R[X] ⧸ P) Sₘ
inst✝ :
  IsLocalization
    (Submonoid.map (quotientMap P C ⋯) (Submonoid.powers (map (Ideal.Quotient.mk (comap C P)) pX).leadingCoeff)) Sₘ
P' : Ideal R := comap C P
M : Submonoid (R ⧸ P') := Submonoid.powers (map (Ideal.Quotient.mk (comap C P)) pX).leadingCoeff
M' : Submonoid (R[X] ⧸ P) :=
  Submonoid.map (quotientMap P C ⋯) (Submonoid.powers (map (Ideal.Quotient.mk (comap C P)) pX).leadingCoeff)
φ : R ⧸ P' →+* R[X] ⧸ P := quotientMap P C ⋯
φ' : Rₘ →+* Sₘ := IsLocalization.map Sₘ φ ⋯
hφ' : φ.comp (Ideal.Quotient.mk P') = (Ideal.Quotient.mk P).comp C
p✝ : Sₘ
q : R[X] ⧸ P
hq : q ∈ M'
p : R[X]
hp : p✝ * (algebraMap (R[X] ⧸ P) Sₘ) q = (algebraMap (R[X] ⧸ P) Sₘ) ((Ideal.Quotient.mk P) p)
⊢ ((algebraMap (R[X] ⧸ P) Sₘ).comp (Ideal.Quotient.mk P)) p ∈
    Subring.closure (⇑((algebraMap (R[X] ⧸ P) Sₘ).comp (Ideal.Quotient.mk P)) '' insert X {p | p.degree ≤ 0})
Module: Mathlib.RingTheory.DiscreteValuationRing.Basic

Goal state before:
pp: case neg
R✝¹ : Type u
inst✝⁵ : CommRing R✝¹
inst✝⁴ : IsDomain R✝¹
inst✝³ : IsDiscreteValuationRing R✝¹
R✝ : Type u_1
R : Type u_2
inst✝² : CommRing R
inst✝¹ : IsDomain R
inst✝ : IsDiscreteValuationRing R
x y : R
hy : y ≠ 0
hyx : ¬y ∣ x
⊢ toWithBotNat x < toWithBotNat y

Tactic:
· exact lt_iff_not_ge.mpr (mt (dvd_of_toWithBotNat_le_toWithBotNat _ _ hy) hyx)

Goal state after:
Module: Mathlib.RingTheory.Valuation.Basic

Goal state before:
pp: Γ₀ : Type u_4
inst✝⁴ : LinearOrderedCommMonoidWithZero Γ₀
B : Type u_7
A : Type u_8
inst✝³ : CommSemiring A
inst✝² : Ring B
inst✝¹ : Algebra A B
v : Valuation B Γ₀
inst✝ : IsTrivialOn A v
a : A
⊢ v ((algebraMap A B) a) ≤ 1

Tactic:
by
  by_cases a = 0 <;> grind [zero_le]

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

Goal state before:
pp: A : Type u_1
inst✝¹ : CommRing A
inst✝ : IsDomain A
h : IsDedekindDomainDvr A
p : Ideal A
hp : p ≠ ⊥
hpp : p.IsPrime
q : Ideal A
hq : q.IsMaximal
hpq : p ≤ q
f : { p // p.IsPrime ∧ Disjoint ↑q.primeCompl ↑p } ≃o { p // p.IsPrime } :=
  (IsLocalization.orderIsoOfPrime q.primeCompl (Localization.AtPrime q)).symm
P : { p // p.IsPrime } := f ⟨p, ⋯⟩
Q : { p // p.IsPrime } := f ⟨q, ⋯⟩
hinj : Function.Injective ⇑(algebraMap A (Localization.AtPrime q))
hp1 : ↑P ≠ ⊥
hq1 : ↑Q ≠ ⊥
left✝ : IsPrincipalIdealRing (Localization.AtPrime q)
huq : ∃! P, P ≠ ⊥ ∧ P.IsPrime
⊢ q.IsMaximal

Tactic:
exact hq

Goal state after:
Module: Mathlib.RingTheory.Jacobson.Ring

Goal state before:
pp: R : Type u_1
inst✝ : CommRing R
hR : IsJacobsonRing R
I : Ideal R[X]
hI : I.IsPrime
⊢ I.jacobson = I

Tactic:
let R' : Subring (R[X] ⧸ I) := ((Ideal.Quotient.mk I).comp C).range

Goal state after:
R : Type u_1
inst✝ : CommRing R
hR : IsJacobsonRing R
I : Ideal R[X]
hI : I.IsPrime
R' : Subring (R[X] ⧸ I) := ((Ideal.Quotient.mk I).comp C).range
⊢ I.jacobson = I
Module: Mathlib.RingTheory.DiscreteValuationRing.TFAE

Goal state before:
pp: case neg
R : Type u_1
inst✝³ : CommRing R
inst✝² : IsNoetherianRing R
inst✝¹ : IsLocalRing R
inst✝ : IsDomain R
hR : ¬IsField R
⊢ finrank (ResidueField R) (CotangentSpace R) = 1 ↔ IsDiscreteValuationRing R

Tactic:
· exact (IsDiscreteValuationRing.TFAE R hR).out 5 0

Goal state after: