mathlib-initiative/mathlib-tactics huggingface dataset:
Module: Mathlib.RingTheory.Valuation.ValuationRing

Goal state before:
pp: case h
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 : ValueGroup A K
xa ya : A
hya : ya ∈ nonZeroDivisors A
xb yb : A
hyb : yb ∈ nonZeroDivisors A
this✝ : (algebraMap A K) ya ≠ 0
this : (algebraMap A K) yb ≠ 0
c : A
h : xa * yb * c = xb * ya
⊢ c • ((algebraMap A K) xa / (algebraMap A K) ya) = (algebraMap A K) xb / (algebraMap A K) yb

Tactic:
rw [Algebra.smul_def]

Goal state after:
case h
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 : ValueGroup A K
xa ya : A
hya : ya ∈ nonZeroDivisors A
xb yb : A
hyb : yb ∈ nonZeroDivisors A
this✝ : (algebraMap A K) ya ≠ 0
this : (algebraMap A K) yb ≠ 0
c : A
h : xa * yb * c = xb * ya
⊢ (algebraMap A K) c * ((algebraMap A K) xa / (algebraMap A K) ya) = (algebraMap A K) xb / (algebraMap A K) yb
Module: Mathlib.RingTheory.Valuation.ValuationRing

Goal state before:
pp: case h
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 : ValueGroup A K
xa ya : A
hya : ya ∈ nonZeroDivisors A
xb yb : A
hyb : yb ∈ nonZeroDivisors A
this✝ : (algebraMap A K) ya ≠ 0
this : (algebraMap A K) yb ≠ 0
c : A
h : xa * yb * c = xb * ya
⊢ (algebraMap A K) c * ((algebraMap A K) xa / (algebraMap A K) ya) = (algebraMap A K) xb / (algebraMap A K) yb

Tactic:
field_simp

Goal state after:
case h
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 : ValueGroup A K
xa ya : A
hya : ya ∈ nonZeroDivisors A
xb yb : A
hyb : yb ∈ nonZeroDivisors A
this✝ : (algebraMap A K) ya ≠ 0
this : (algebraMap A K) yb ≠ 0
c : A
h : xa * yb * c = xb * ya
⊢ (algebraMap A K) c * (algebraMap A K) xa * (algebraMap A K) yb = (algebraMap A K) ya * (algebraMap A K) xb
Module: Mathlib.RingTheory.Valuation.ValuationRing

Goal state before:
pp: case h
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 : ValueGroup A K
xa ya : A
hya : ya ∈ nonZeroDivisors A
xb yb : A
hyb : yb ∈ nonZeroDivisors A
this✝ : (algebraMap A K) ya ≠ 0
this : (algebraMap A K) yb ≠ 0
c : A
h : xb * ya * c = xa * yb
⊢ c • ((algebraMap A K) xb / (algebraMap A K) yb) = (algebraMap A K) xa / (algebraMap A K) ya

Tactic:
rw [Algebra.smul_def]

Goal state after:
case h
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 : ValueGroup A K
xa ya : A
hya : ya ∈ nonZeroDivisors A
xb yb : A
hyb : yb ∈ nonZeroDivisors A
this✝ : (algebraMap A K) ya ≠ 0
this : (algebraMap A K) yb ≠ 0
c : A
h : xb * ya * c = xa * yb
⊢ (algebraMap A K) c * ((algebraMap A K) xb / (algebraMap A K) yb) = (algebraMap A K) xa / (algebraMap A K) ya
Module: Mathlib.RingTheory.Valuation.ValuationRing

Goal state before:
pp: case h
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 : ValueGroup A K
xa ya : A
hya : ya ∈ nonZeroDivisors A
xb yb : A
hyb : yb ∈ nonZeroDivisors A
this✝ : (algebraMap A K) ya ≠ 0
this : (algebraMap A K) yb ≠ 0
c : A
h : xb * ya * c = xa * yb
⊢ (algebraMap A K) c * ((algebraMap A K) xb / (algebraMap A K) yb) = (algebraMap A K) xa / (algebraMap A K) ya

Tactic:
field_simp

Goal state after:
case h
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 : ValueGroup A K
xa ya : A
hya : ya ∈ nonZeroDivisors A
xb yb : A
hyb : yb ∈ nonZeroDivisors A
this✝ : (algebraMap A K) ya ≠ 0
this : (algebraMap A K) yb ≠ 0
c : A
h : xb * ya * c = xa * yb
⊢ (algebraMap A K) c * (algebraMap A K) xb * (algebraMap A K) ya = (algebraMap A K) yb * (algebraMap A K) xa
Module: Mathlib.RingTheory.AdicCompletion.Basic

Goal state before:
pp: case h
R : Type u_1
S : Type u_2
inst✝⁷ : CommRing R
I : Ideal R
M : Type u_4
inst✝⁶ : AddCommGroup M
inst✝⁵ : Module R M
inst✝⁴ : CommRing S
inst✝³ : Module S M
J : Ideal S
inst✝² : Algebra R S
inst✝¹ : IsScalarTower R S M
hIJ : Ideal.map (algebraMap R S) I ≤ J
inst✝ : IsHausdorff J M
x : M
h : ∀ (n : ℕ), x ≡ 0 [SMOD I ^ n • ⊤]
n : ℕ
r : R
⊢ r ∈ (I ^ n).toAddSubmonoid → ∀ n_1 ∈ ⊤, r • n_1 ∈ (J ^ n).toAddSubmonoid • ⊤

Tactic:
hr

Goal state after:
case h
R : Type u_1
S : Type u_2
inst✝⁷ : CommRing R
I : Ideal R
M : Type u_4
inst✝⁶ : AddCommGroup M
inst✝⁵ : Module R M
inst✝⁴ : CommRing S
inst✝³ : Module S M
J : Ideal S
inst✝² : Algebra R S
inst✝¹ : IsScalarTower R S M
hIJ : Ideal.map (algebraMap R S) I ≤ J
inst✝ : IsHausdorff J M
x : M
h : ∀ (n : ℕ), x ≡ 0 [SMOD I ^ n • ⊤]
n : ℕ
r : R
hr : r ∈ (I ^ n).toAddSubmonoid
⊢ ∀ n_1 ∈ ⊤, r • n_1 ∈ (J ^ n).toAddSubmonoid • ⊤
Module: Mathlib.RingTheory.Valuation.ValuationRing

Goal state before:
pp: case h
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
xa ya : A
hya : ya ∈ nonZeroDivisors A
xb yb : A
hyb : yb ∈ nonZeroDivisors A
this✝ : (algebraMap A K) ya ≠ 0
this : (algebraMap A K) yb ≠ 0
c : A
h : xa * yb * c = xb * ya
⊢ (c + 1) • ((algebraMap A K) xa / (algebraMap A K) ya) =
    (algebraMap A K) xa / (algebraMap A K) ya + (algebraMap A K) xb / (algebraMap A K) yb

Tactic:
rw [Algebra.smul_def]

Goal state after:
case h
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
xa ya : A
hya : ya ∈ nonZeroDivisors A
xb yb : A
hyb : yb ∈ nonZeroDivisors A
this✝ : (algebraMap A K) ya ≠ 0
this : (algebraMap A K) yb ≠ 0
c : A
h : xa * yb * c = xb * ya
⊢ (algebraMap A K) (c + 1) * ((algebraMap A K) xa / (algebraMap A K) ya) =
    (algebraMap A K) xa / (algebraMap A K) ya + (algebraMap A K) xb / (algebraMap A K) yb
Module: Mathlib.RingTheory.Valuation.ValuationRing

Goal state before:
pp: case h
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
xa ya : A
hya : ya ∈ nonZeroDivisors A
xb yb : A
hyb : yb ∈ nonZeroDivisors A
this✝ : (algebraMap A K) ya ≠ 0
this : (algebraMap A K) yb ≠ 0
c : A
h : xa * yb * c = xb * ya
⊢ (algebraMap A K) (c + 1) * ((algebraMap A K) xa / (algebraMap A K) ya) =
    (algebraMap A K) xa / (algebraMap A K) ya + (algebraMap A K) xb / (algebraMap A K) yb

Tactic:
field_simp

Goal state after:
case h
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
xa ya : A
hya : ya ∈ nonZeroDivisors A
xb yb : A
hyb : yb ∈ nonZeroDivisors A
this✝ : (algebraMap A K) ya ≠ 0
this : (algebraMap A K) yb ≠ 0
c : A
h : xa * yb * c = xb * ya
⊢ (algebraMap A K) (c + 1) * (algebraMap A K) xa * (algebraMap A K) yb =
    (algebraMap A K) xa * (algebraMap A K) yb + (algebraMap A K) ya * (algebraMap A K) xb
Module: Mathlib.RingTheory.Valuation.ValuationRing

Goal state before:
pp: case h
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
xa ya : A
hya : ya ∈ nonZeroDivisors A
xb yb : A
hyb : yb ∈ nonZeroDivisors A
this✝ : (algebraMap A K) ya ≠ 0
this : (algebraMap A K) yb ≠ 0
c : A
h : xb * ya * c = xa * yb
⊢ (c + 1) • ((algebraMap A K) xb / (algebraMap A K) yb) =
    (algebraMap A K) xa / (algebraMap A K) ya + (algebraMap A K) xb / (algebraMap A K) yb

Tactic:
rw [Algebra.smul_def]

Goal state after:
case h
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
xa ya : A
hya : ya ∈ nonZeroDivisors A
xb yb : A
hyb : yb ∈ nonZeroDivisors A
this✝ : (algebraMap A K) ya ≠ 0
this : (algebraMap A K) yb ≠ 0
c : A
h : xb * ya * c = xa * yb
⊢ (algebraMap A K) (c + 1) * ((algebraMap A K) xb / (algebraMap A K) yb) =
    (algebraMap A K) xa / (algebraMap A K) ya + (algebraMap A K) xb / (algebraMap A K) yb
Module: Mathlib.RingTheory.Valuation.ValuationRing

Goal state before:
pp: case h
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
xa ya : A
hya : ya ∈ nonZeroDivisors A
xb yb : A
hyb : yb ∈ nonZeroDivisors A
this✝ : (algebraMap A K) ya ≠ 0
this : (algebraMap A K) yb ≠ 0
c : A
h : xb * ya * c = xa * yb
⊢ (algebraMap A K) (c + 1) * ((algebraMap A K) xb / (algebraMap A K) yb) =
    (algebraMap A K) xa / (algebraMap A K) ya + (algebraMap A K) xb / (algebraMap A K) yb

Tactic:
field_simp

Goal state after:
case h
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
xa ya : A
hya : ya ∈ nonZeroDivisors A
xb yb : A
hyb : yb ∈ nonZeroDivisors A
this✝ : (algebraMap A K) ya ≠ 0
this : (algebraMap A K) yb ≠ 0
c : A
h : xb * ya * c = xa * yb
⊢ (algebraMap A K) (c + 1) * (algebraMap A K) xb * (algebraMap A K) ya =
    (algebraMap A K) yb * (algebraMap A K) xa + (algebraMap A K) xb * (algebraMap A K) ya
Module: Mathlib.RingTheory.AdicCompletion.Basic

Goal state before:
pp: R : Type u_6
S : Type u_7
inst✝¹ : CommRing S
I : Ideal S
inst✝ : IsHausdorff I S
f g : R → S
a : ℕ → ℕ
ha : StrictMono a
h : ∀ (n : ℕ) (r : R), (Ideal.Quotient.mk (I ^ a n)) (f r) = (Ideal.Quotient.mk (I ^ a n)) (g r)
⊢ f = g

Tactic:
by
  ext m
  rw [IsHausdorff.eq_iff_smodEq (I := I)]
  intro n
  apply SModEq.mono (Submodule.pow_smul_top_le I S ha.le_apply)
  simpa using! h n m

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

Goal state before:
pp: F : Type u
Γ₀ : Type v
inst✝⁴ : Field F
inst✝³ : LinearOrderedCommGroupWithZero Γ₀
v : Valuation F Γ₀
O : Type w
inst✝² : CommRing O
inst✝¹ : Algebra O F
inst✝ : IsPrincipalIdealRing O
hv : v.Integers O
H : DenselyOrdered ↑(range ⇑v)
⊢ ∀ (c : O) {x : O}, x ∈ ⇑v ∘ ⇑(algebraMap O F) ⁻¹' Iio 1 → c • x ∈ ⇑v ∘ ⇑(algebraMap O F) ⁻¹' Iio 1

Tactic:
intro c x
      simp only [mem_preimage, Function.comp_apply, mem_Iio, smul_eq_mul, map_mul]
      intro hx
      exact Right.mul_lt_one_of_le_of_lt (hv.map_le_one c) hx

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

Goal state before:
pp: case neg
A : Type u
inst✝² : CommRing A
inst✝¹ : Nontrivial A
inst✝ : PreValuationRing A
α β : Ideal A
a : A
h₁ : a ∈ α
h₂ : a ∉ β
b : A
hb : b ∈ β
⊢ b ∈ α

Tactic:
obtain ⟨c, h | h⟩ := PreValuationRing.cond a b

Goal state after:
case neg.inl
A : Type u
inst✝² : CommRing A
inst✝¹ : Nontrivial A
inst✝ : PreValuationRing A
α β : Ideal A
a : A
h₁ : a ∈ α
h₂ : a ∉ β
b : A
hb : b ∈ β
c : A
h : a * c = b
⊢ b ∈ α

case neg.inr
A : Type u
inst✝² : CommRing A
inst✝¹ : Nontrivial A
inst✝ : PreValuationRing A
α β : Ideal A
a : A
h₁ : a ∈ α
h₂ : a ∉ β
b : A
hb : b ∈ β
c : A
h : b * c = a
⊢ b ∈ α
Module: Mathlib.RingTheory.Valuation.Integers

Goal state before:
pp: case inr
Γ₀ : Type v
inst✝¹ : LinearOrderedCommGroupWithZero Γ₀
K : Type u_1
inst✝ : Field K
v : Valuation K Γ₀
S : Submodule (↥v.integer) K
x : K
hx : x ∈ S
hx0 : x ≠ 0
y : K
hy : y ∈ v.leSubmodule (v x)
⊢ y ∈ S

Tactic:
have : v ((y : K) / x) ≤ 1 := by simp [div_le_one_of_le₀ hy]

Goal state after:
case inr
Γ₀ : Type v
inst✝¹ : LinearOrderedCommGroupWithZero Γ₀
K : Type u_1
inst✝ : Field K
v : Valuation K Γ₀
S : Submodule (↥v.integer) K
x : K
hx : x ∈ S
hx0 : x ≠ 0
y : K
hy : y ∈ v.leSubmodule (v x)
this : v (y / x) ≤ 1
⊢ y ∈ S
Module: Mathlib.RingTheory.Valuation.ValuationRing

Goal state before:
pp: case neg.inr
R : Type u_1
inst✝⁴ : CommRing R
inst✝³ : IsDomain R
K : Type u_2
inst✝² : Field K
inst✝¹ : Algebra R K
inst✝ : IsFractionRing R K
H : ∀ (x : K), IsLocalization.IsInteger R x ∨ IsLocalization.IsInteger R x⁻¹
a b : R
ha : (algebraMap R K) a ≠ 0
hb : (algebraMap R K) b ≠ 0
c : R
e : (algebraMap R K) c = ((algebraMap R K) a / (algebraMap R K) b)⁻¹
⊢ ∃ c, a * c = b ∨ b * c = a

Tactic:
· rw [inv_div, eq_div_iff ha, ← map_mul, (IsFractionRing.injective R K).eq_iff, mul_comm c] at e
      exact ⟨c, Or.inl e⟩

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

Goal state before:
pp: R : Type u_1
S : Type u_2
T : Type u_3
inst✝⁴ : CommRing R
I : Ideal R
M : Type u_4
inst✝³ : AddCommGroup M
inst✝² : Module R M
N : Type u_5
inst✝¹ : AddCommGroup N
inst✝ : Module R N
⊢ ∀ (c : R) {x : ℕ → M}, x ∈ {f | IsAdicCauchy I M f} → c • x ∈ {f | IsAdicCauchy I M f}

Tactic:
by
    intro r f hf m n hmn
    exact SModEq.smul (hf hmn) r

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

Goal state before:
pp: 𝒪 : Type u
K : Type v
inst✝² : CommRing 𝒪
inst✝¹ : Field K
inst✝ : Algebra 𝒪 K
h : ∀ (x : K), ∃ a, x = (algebraMap 𝒪 K) a ∨ x⁻¹ = (algebraMap 𝒪 K) a
hinj : Function.Injective ⇑(algebraMap 𝒪 K)
this✝¹ : IsDomain 𝒪
this✝ : FaithfulSMul 𝒪 K
this : IsDomain 𝒪
x : K
⊢ ∃ x_1, x * (algebraMap 𝒪 K) ↑x_1.2 = (algebraMap 𝒪 K) x_1.1

Tactic:
obtain ⟨a, ha⟩ := h x

Goal state after:
𝒪 : Type u
K : Type v
inst✝² : CommRing 𝒪
inst✝¹ : Field K
inst✝ : Algebra 𝒪 K
h : ∀ (x : K), ∃ a, x = (algebraMap 𝒪 K) a ∨ x⁻¹ = (algebraMap 𝒪 K) a
hinj : Function.Injective ⇑(algebraMap 𝒪 K)
this✝¹ : IsDomain 𝒪
this✝ : FaithfulSMul 𝒪 K
this : IsDomain 𝒪
x : K
a : 𝒪
ha : x = (algebraMap 𝒪 K) a ∨ x⁻¹ = (algebraMap 𝒪 K) a
⊢ ∃ x_1, x * (algebraMap 𝒪 K) ↑x_1.2 = (algebraMap 𝒪 K) x_1.1
Module: Mathlib.RingTheory.Valuation.ValuationRing

Goal state before:
pp: case inl
𝒪 : Type u
K : Type v
Γ : Type w
inst✝³ : CommRing 𝒪
inst✝² : Field K
inst✝¹ : Algebra 𝒪 K
inst✝ : LinearOrderedCommGroupWithZero Γ
v : Valuation K Γ
hh : v.Integers 𝒪
this : IsDomain 𝒪
a b : 𝒪
h : v ((algebraMap 𝒪 K) a) ≤ v ((algebraMap 𝒪 K) b)
⊢ ∃ c, a * c = b ∨ b * c = a

Tactic:
obtain ⟨c, hc⟩ := Valuation.Integers.dvd_of_le hh h

Goal state after:
case inl
𝒪 : Type u
K : Type v
Γ : Type w
inst✝³ : CommRing 𝒪
inst✝² : Field K
inst✝¹ : Algebra 𝒪 K
inst✝ : LinearOrderedCommGroupWithZero Γ
v : Valuation K Γ
hh : v.Integers 𝒪
this : IsDomain 𝒪
a b : 𝒪
h : v ((algebraMap 𝒪 K) a) ≤ v ((algebraMap 𝒪 K) b)
c : 𝒪
hc : a = b * c
⊢ ∃ c, a * c = b ∨ b * c = a
Module: Mathlib.RingTheory.Valuation.ValuationRing

Goal state before:
pp: case inr
𝒪 : Type u
K : Type v
Γ : Type w
inst✝³ : CommRing 𝒪
inst✝² : Field K
inst✝¹ : Algebra 𝒪 K
inst✝ : LinearOrderedCommGroupWithZero Γ
v : Valuation K Γ
hh : v.Integers 𝒪
this : IsDomain 𝒪
a b : 𝒪
h : v ((algebraMap 𝒪 K) b) ≤ v ((algebraMap 𝒪 K) a)
⊢ ∃ c, a * c = b ∨ b * c = a

Tactic:
obtain ⟨c, hc⟩ := Valuation.Integers.dvd_of_le hh h

Goal state after:
case inr
𝒪 : Type u
K : Type v
Γ : Type w
inst✝³ : CommRing 𝒪
inst✝² : Field K
inst✝¹ : Algebra 𝒪 K
inst✝ : LinearOrderedCommGroupWithZero Γ
v : Valuation K Γ
hh : v.Integers 𝒪
this : IsDomain 𝒪
a b : 𝒪
h : v ((algebraMap 𝒪 K) b) ≤ v ((algebraMap 𝒪 K) a)
c : 𝒪
hc : b = a * c
⊢ ∃ c, a * c = b ∨ b * c = a
Module: Mathlib.RingTheory.DiscreteValuationRing.Basic

Goal state before:
pp: case h.a
R : Type u
inst✝¹ : CommRing R
inst✝ : UniqueFactorizationMonoid R
h₁ : ∃ p, Irreducible p
h₂ : ∀ ⦃p q : R⦄, Irreducible p → Irreducible q → Associated p q
I : Ideal R
I0 : ¬I = ⊥
x : R
hxI : x ∈ I
hx0 : x ≠ 0
p : R
left✝ : Irreducible p
H : ∀ {x : R}, x ≠ 0 → ∃ n, Associated (p ^ n) x
ex : ∃ n, p ^ n ∈ I
r : R
⊢ r ∈ I → r ∈ span {p ^ Nat.find ex}

Tactic:
hr

Goal state after:
case h.a
R : Type u
inst✝¹ : CommRing R
inst✝ : UniqueFactorizationMonoid R
h₁ : ∃ p, Irreducible p
h₂ : ∀ ⦃p q : R⦄, Irreducible p → Irreducible q → Associated p q
I : Ideal R
I0 : ¬I = ⊥
x : R
hxI : x ∈ I
hx0 : x ≠ 0
p : R
left✝ : Irreducible p
H : ∀ {x : R}, x ≠ 0 → ∃ n, Associated (p ^ n) x
ex : ∃ n, p ^ n ∈ I
r : R
hr : r ∈ I
⊢ r ∈ span {p ^ Nat.find ex}
Module: Mathlib.RingTheory.Jacobson.Ring

Goal state before:
pp: R : Type u_1
S : Type u_2
inst✝⁴ : CommRing R
inst✝³ : CommRing S
inst✝² : Algebra R S
inst✝¹ : Algebra.IsIntegral R S
inst✝ : IsJacobsonRing R
P : Ideal S
hP : P.IsPrime
hP_top : ¬comap (algebraMap R S) P = ⊤
this : Nontrivial (R ⧸ comap (algebraMap R S) P)
J : Ideal (R ⧸ comap (algebraMap R S) P)
hJ : J ∈ {J | ⊥ ≤ J ∧ J.IsMaximal}
⊢ J.IsMaximal

Tactic:
simpa using hJ

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

Goal state before:
pp: R : Type u_3
Γ₀ : Type u_4
inst✝¹ : Ring R
inst✝ : LinearOrderedCommMonoidWithZero Γ₀
⊢ Injective toMonoidWithZeroHom

Tactic:
by
  rintro ⟨f, _⟩ g hfg; congr!

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

Goal state before:
pp: case inr
R : Type u_3
Γ₀ : Type u_4
inst✝¹ : Ring R
inst✝ : LinearOrderedCommMonoidWithZero Γ₀
v : Valuation R Γ₀
x y : R
h : v x ≠ v y
h' : v (x + y) < max (v x) (v y)
this : ∀ {x y : R}, v x ≠ v y → v (x + y) < max (v x) (v y) → v y < v x → False
vyx : ¬v y < v x
⊢ False

pp: R : Type u_3
Γ₀ : Type u_4
inst✝¹ : Ring R
inst✝ : LinearOrderedCommMonoidWithZero Γ₀
v : Valuation R Γ₀
x✝ y✝ x y : R
h : v x ≠ v y
h' : v (x + y) < max (v x) (v y)
vyx : v y < v x
⊢ False

Tactic:
· refine this h.symm ?_ (h.lt_or_gt.resolve_right vyx)
    rwa [add_comm, max_comm]

Goal state after:
R : Type u_3
Γ₀ : Type u_4
inst✝¹ : Ring R
inst✝ : LinearOrderedCommMonoidWithZero Γ₀
v : Valuation R Γ₀
x✝ y✝ x y : R
h : v x ≠ v y
h' : v (x + y) < max (v x) (v y)
vyx : v y < v x
⊢ False
Module: Mathlib.RingTheory.Jacobson.Ring

Goal state before:
pp: case refine_3
R : Type u_1
inst✝ : Ring R
p : R[X]
n : ℕ
r : R
⊢ C r * X ^ n ∈ Subring.closure (insert X {f | f.degree ≤ 0}) →
    C r * X ^ (n + 1) ∈ Subring.closure (insert X {f | f.degree ≤ 0})

Tactic:
hr

Goal state after:
case refine_3
R : Type u_1
inst✝ : Ring R
p : R[X]
n : ℕ
r : R
hr : C r * X ^ n ∈ Subring.closure (insert X {f | f.degree ≤ 0})
⊢ C r * X ^ (n + 1) ∈ Subring.closure (insert X {f | f.degree ≤ 0})
Module: Mathlib.RingTheory.DiscreteValuationRing.TFAE

Goal state before:
pp: R : Type u_1
inst✝³ : CommRing R
inst✝² : IsNoetherianRing R
inst✝¹ : IsLocalRing R
inst✝ : IsDomain R
I : Ideal R
hI : I ≠ ⊥
h : ¬IsField R
x : R
hx : maximalIdeal R = Ideal.span {x}
hI' : ¬I = ⊤
H : ∀ (r : R), ¬IsUnit r ↔ x ∣ r
this : x ≠ 0
hx' : Irreducible x
r : R
⊢ r ≠ 0 → r ∈ nonunits R → ∃ n, Associated (x ^ n) r

Tactic:
hr₁

Goal state after:
R : Type u_1
inst✝³ : CommRing R
inst✝² : IsNoetherianRing R
inst✝¹ : IsLocalRing R
inst✝ : IsDomain R
I : Ideal R
hI : I ≠ ⊥
h : ¬IsField R
x : R
hx : maximalIdeal R = Ideal.span {x}
hI' : ¬I = ⊤
H : ∀ (r : R), ¬IsUnit r ↔ x ∣ r
this : x ≠ 0
hx' : Irreducible x
r : R
hr₁ : r ≠ 0
⊢ r ∈ nonunits R → ∃ n, Associated (x ^ n) r
Module: Mathlib.RingTheory.DiscreteValuationRing.Basic

Goal state before:
pp: case neg
R : Type u_1
inst✝² : CommRing R
inst✝¹ : IsDomain R
inst✝ : IsDiscreteValuationRing R
a b : R
hp : Prime (Classical.choose ⋯)
h : (addVal R) a ≤ (addVal R) b
ha0 : ¬a = 0
⊢ a ∣ b

Tactic:
obtain ⟨n, ha⟩ := associated_pow_irreducible ha0 hp.irreducible

Goal state after:
case neg
R : Type u_1
inst✝² : CommRing R
inst✝¹ : IsDomain R
inst✝ : IsDiscreteValuationRing R
a b : R
hp : Prime (Classical.choose ⋯)
h : (addVal R) a ≤ (addVal R) b
ha0 : ¬a = 0
n : ℕ
ha : Associated a (Classical.choose ⋯ ^ n)
⊢ a ∣ b
Module: Mathlib.RingTheory.DiscreteValuationRing.TFAE

Goal state before:
pp: case cons.inr
R : Type u_1
inst✝³ : CommRing R
inst✝² : IsNoetherianRing R
inst✝¹ : IsLocalRing R
inst✝ : IsDomain R
I : Ideal R
hI : I ≠ ⊥
h : ¬IsField R
x : R
hx : maximalIdeal R = Ideal.span {x}
hI' : ¬I = ⊤
H : ∀ (r : R), ¬IsUnit r ↔ x ∣ r
this✝ : x ≠ 0
hx' : Irreducible x
fa : R
fs : Multiset R
fh : fs ≠ ∅ → (∀ b ∈ fs, Associated x b) → ∃ n, Associated (x ^ n) fs.prod
hf₂ : fa ::ₘ fs ≠ ∅
this : ∀ b ∈ fa ::ₘ fs, Associated x b
hf' : fs ≠ ∅
n : ℕ
hn : Associated (x ^ n) fs.prod
⊢ ∃ n, Associated (x ^ n) (fa ::ₘ fs).prod

Tactic:
use n + 1

Goal state after:
case h
R : Type u_1
inst✝³ : CommRing R
inst✝² : IsNoetherianRing R
inst✝¹ : IsLocalRing R
inst✝ : IsDomain R
I : Ideal R
hI : I ≠ ⊥
h : ¬IsField R
x : R
hx : maximalIdeal R = Ideal.span {x}
hI' : ¬I = ⊤
H : ∀ (r : R), ¬IsUnit r ↔ x ∣ r
this✝ : x ≠ 0
hx' : Irreducible x
fa : R
fs : Multiset R
fh : fs ≠ ∅ → (∀ b ∈ fs, Associated x b) → ∃ n, Associated (x ^ n) fs.prod
hf₂ : fa ::ₘ fs ≠ ∅
this : ∀ b ∈ fa ::ₘ fs, Associated x b
hf' : fs ≠ ∅
n : ℕ
hn : Associated (x ^ n) fs.prod
⊢ Associated (x ^ (n + 1)) (fa ::ₘ fs).prod
Module: Mathlib.RingTheory.Jacobson.Ring

Goal state before:
pp: S : Type u_2
inst✝¹⁰ : CommRing S
inst✝⁹ : IsDomain S
R : Type u_5
inst✝⁸ : CommRing R
inst✝⁷ : IsDomain R
inst✝⁶ : IsJacobsonRing R
Rₘ : Type u_6
Sₘ : Type u_7
inst✝⁵ : CommRing Rₘ
inst✝⁴ : CommRing Sₘ
φ : R →+* S
hφ : Function.Injective ⇑φ
x : R
hx : x ≠ 0
inst✝³ : Algebra R Rₘ
inst✝² : IsLocalization.Away x Rₘ
inst✝¹ : Algebra S Sₘ
inst✝ : IsLocalization (Submonoid.map φ (Submonoid.powers x)) Sₘ
hφ' : (IsLocalization.map Sₘ φ ⋯).IsIntegral
hM : Submonoid.map φ (Submonoid.powers x) ≤ nonZeroDivisors S
this✝ : IsDomain Sₘ := IsLocalization.isDomain_of_le_nonZeroDivisors Sₘ hM
φ' : Rₘ →+* Sₘ := IsLocalization.map Sₘ φ ⋯
this : ∀ (I : Ideal Sₘ), I.IsMaximal → (comap (algebraMap S Sₘ) I).IsMaximal
hϕ' : comap (algebraMap S Sₘ) ⊥ = ⊥
⊢ ⊥.jacobson = ⊥

Tactic:
have hRₘ : IsJacobsonRing Rₘ := isJacobsonRing_localization x

Goal state after:
S : Type u_2
inst✝¹⁰ : CommRing S
inst✝⁹ : IsDomain S
R : Type u_5
inst✝⁸ : CommRing R
inst✝⁷ : IsDomain R
inst✝⁶ : IsJacobsonRing R
Rₘ : Type u_6
Sₘ : Type u_7
inst✝⁵ : CommRing Rₘ
inst✝⁴ : CommRing Sₘ
φ : R →+* S
hφ : Function.Injective ⇑φ
x : R
hx : x ≠ 0
inst✝³ : Algebra R Rₘ
inst✝² : IsLocalization.Away x Rₘ
inst✝¹ : Algebra S Sₘ
inst✝ : IsLocalization (Submonoid.map φ (Submonoid.powers x)) Sₘ
hφ' : (IsLocalization.map Sₘ φ ⋯).IsIntegral
hM : Submonoid.map φ (Submonoid.powers x) ≤ nonZeroDivisors S
this✝ : IsDomain Sₘ := IsLocalization.isDomain_of_le_nonZeroDivisors Sₘ hM
φ' : Rₘ →+* Sₘ := IsLocalization.map Sₘ φ ⋯
this : ∀ (I : Ideal Sₘ), I.IsMaximal → (comap (algebraMap S Sₘ) I).IsMaximal
hϕ' : comap (algebraMap S Sₘ) ⊥ = ⊥
hRₘ : IsJacobsonRing Rₘ
⊢ ⊥.jacobson = ⊥
Module: Mathlib.RingTheory.DiscreteValuationRing.TFAE

Goal state before:
pp: R : Type u_1
inst✝² : CommRing R
inst✝¹ : IsLocalRing R
inst✝ : IsDedekindDomain R
ne_bot : ¬maximalIdeal R = ⊥
a : R
ha₁ : a ∈ maximalIdeal R
ha₂ : a ≠ 0
hle : Ideal.span {a} ≤ maximalIdeal R
this✝ : (Ideal.span {a}).radical = maximalIdeal R
this : ∃ n, maximalIdeal R ^ n ≤ Ideal.span {a}
n : ℕ
hn : Nat.find this = n + 1
b : R
hb₁ : b ∈ maximalIdeal R ^ n
hb₂ : b ∉ Ideal.span {a}
hb₃ : ∀ m ∈ maximalIdeal R, ∃ k, k * a = b * m
hb₄ : b ≠ 0
K : Type u_1 := FractionRing R
x : K := (algebraMap R K) b / (algebraMap R K) a
M : Submodule R K := Submodule.map (Algebra.linearMap R K) (maximalIdeal R)
ha₃ : (algebraMap R K) a ≠ 0
h : Submodule.comap (Algebra.linearMap R K) (Submodule.map (DistribSMul.toLinearMap R K x) M) ≠ ⊤
⊢ ∀ y ∈ M, x * y ∈ M

Tactic:
rintro m' ⟨m, hm, rfl : algebraMap R K m = m'⟩

Goal state after:
R : Type u_1
inst✝² : CommRing R
inst✝¹ : IsLocalRing R
inst✝ : IsDedekindDomain R
ne_bot : ¬maximalIdeal R = ⊥
a : R
ha₁ : a ∈ maximalIdeal R
ha₂ : a ≠ 0
hle : Ideal.span {a} ≤ maximalIdeal R
this✝ : (Ideal.span {a}).radical = maximalIdeal R
this : ∃ n, maximalIdeal R ^ n ≤ Ideal.span {a}
n : ℕ
hn : Nat.find this = n + 1
b : R
hb₁ : b ∈ maximalIdeal R ^ n
hb₂ : b ∉ Ideal.span {a}
hb₃ : ∀ m ∈ maximalIdeal R, ∃ k, k * a = b * m
hb₄ : b ≠ 0
K : Type u_1 := FractionRing R
x : K := (algebraMap R K) b / (algebraMap R K) a
M : Submodule R K := Submodule.map (Algebra.linearMap R K) (maximalIdeal R)
ha₃ : (algebraMap R K) a ≠ 0
h : Submodule.comap (Algebra.linearMap R K) (Submodule.map (DistribSMul.toLinearMap R K x) M) ≠ ⊤
m : R
hm : m ∈ ↑(maximalIdeal R)
⊢ x * (algebraMap R K) m ∈ M