Theorem: coeSubmodule_differentIdeal
File: Mathlib/RingTheory/DedekindDomain/Different.lean

tactic: have : (FractionRing.algEquiv B L).toLinearEquiv.comp (Algebra.linearMap B (FractionRing B)) =
  Algebra.linearMap B L := by ext; simp
state_before: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
⊢ coeSubmodule L (differentIdeal A B) = 1 / 1ᵛ
state_after: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
⊢ coeSubmodule L (differentIdeal A B) = 1 / 1ᵛ

tactic: rw [coeSubmodule, ← this]
state_before: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
⊢ coeSubmodule L (differentIdeal A B) = 1 / 1ᵛ
state_after: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
⊢ Submodule.map (↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B))
      (differentIdeal A B) =
    1 / 1ᵛ

tactic: have H : RingHom.comp (algebraMap (FractionRing A) (FractionRing B))
    ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
      RingHom.comp ↑(FractionRing.algEquiv B L).symm.toRingEquiv (algebraMap K L) := by
  apply IsLocalization.ringHom_ext A⁰
  ext
  simp only [AlgEquiv.toRingEquiv_eq_coe, RingHom.coe_comp, RingHom.coe_coe,
    AlgEquiv.coe_ringEquiv, Function.comp_apply, AlgEquiv.commutes,
    ← IsScalarTower.algebraMap_apply]
  rw [IsScalarTower.algebraMap_apply A B L, AlgEquiv.commutes, ← IsScalarTower.algebraMap_apply]
state_before: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
⊢ Submodule.map (↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B))
      (differentIdeal A B) =
    1 / 1ᵛ
state_after: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
⊢ Submodule.map (↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B))
      (differentIdeal A B) =
    1 / 1ᵛ

tactic: have : IsSeparable (FractionRing A) (FractionRing B) := IsSeparable.of_equiv_equiv _ _ H
state_before: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
⊢ Submodule.map (↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B))
      (differentIdeal A B) =
    1 / 1ᵛ
state_after: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝ : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this : IsSeparable (FractionRing A) (FractionRing B)
⊢ Submodule.map (↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B))
      (differentIdeal A B) =
    1 / 1ᵛ

tactic: have : FiniteDimensional (FractionRing A) (FractionRing B) := Module.Finite.of_equiv_equiv _ _ H
state_before: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝ : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this : IsSeparable (FractionRing A) (FractionRing B)
⊢ Submodule.map (↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B))
      (differentIdeal A B) =
    1 / 1ᵛ
state_after: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝¹ : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this✝ : IsSeparable (FractionRing A) (FractionRing B)
this : FiniteDimensional (FractionRing A) (FractionRing B)
⊢ Submodule.map (↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B))
      (differentIdeal A B) =
    1 / 1ᵛ

tactic: have : Algebra.IsIntegral A B := IsIntegralClosure.isIntegral_algebra _ L
state_before: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝¹ : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this✝ : IsSeparable (FractionRing A) (FractionRing B)
this : FiniteDimensional (FractionRing A) (FractionRing B)
⊢ Submodule.map (↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B))
      (differentIdeal A B) =
    1 / 1ᵛ
state_after: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝² : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this✝¹ : IsSeparable (FractionRing A) (FractionRing B)
this✝ : FiniteDimensional (FractionRing A) (FractionRing B)
this : Algebra.IsIntegral A B
⊢ Submodule.map (↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B))
      (differentIdeal A B) =
    1 / 1ᵛ

tactic: simp only [AlgEquiv.toLinearEquiv_toLinearMap, Submodule.map_comp]
state_before: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝² : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this✝¹ : IsSeparable (FractionRing A) (FractionRing B)
this✝ : FiniteDimensional (FractionRing A) (FractionRing B)
this : Algebra.IsIntegral A B
⊢ Submodule.map (↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B))
      (differentIdeal A B) =
    1 / 1ᵛ
state_after: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝² : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this✝¹ : IsSeparable (FractionRing A) (FractionRing B)
this✝ : FiniteDimensional (FractionRing A) (FractionRing B)
this : Algebra.IsIntegral A B
⊢ Submodule.map (FractionRing.algEquiv B L).toLinearMap
      (Submodule.map (Algebra.linearMap B (FractionRing B)) (differentIdeal A B)) =
    1 / 1ᵛ

tactic: rw [← coeSubmodule, coeSubmodule_differentIdeal_fractionRing _ _,
  Submodule.map_div, ← AlgEquiv.toAlgHom_toLinearMap, Submodule.map_one]
state_before: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝² : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this✝¹ : IsSeparable (FractionRing A) (FractionRing B)
this✝ : FiniteDimensional (FractionRing A) (FractionRing B)
this : Algebra.IsIntegral A B
⊢ Submodule.map (FractionRing.algEquiv B L).toLinearMap
      (Submodule.map (Algebra.linearMap B (FractionRing B)) (differentIdeal A B)) =
    1 / 1ᵛ
state_after: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝² : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this✝¹ : IsSeparable (FractionRing A) (FractionRing B)
this✝ : FiniteDimensional (FractionRing A) (FractionRing B)
this : Algebra.IsIntegral A B
⊢ 1 / Submodule.map (↑(FractionRing.algEquiv B L)).toLinearMap (traceDual A (FractionRing A) 1) = 1 / 1ᵛ

tactic: congr 1
state_before: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝² : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this✝¹ : IsSeparable (FractionRing A) (FractionRing B)
this✝ : FiniteDimensional (FractionRing A) (FractionRing B)
this : Algebra.IsIntegral A B
⊢ 1 / Submodule.map (↑(FractionRing.algEquiv B L)).toLinearMap (traceDual A (FractionRing A) 1) = 1 / 1ᵛ
state_after: case e_a
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝² : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this✝¹ : IsSeparable (FractionRing A) (FractionRing B)
this✝ : FiniteDimensional (FractionRing A) (FractionRing B)
this : Algebra.IsIntegral A B
⊢ Submodule.map (↑(FractionRing.algEquiv B L)).toLinearMap (traceDual A (FractionRing A) 1) = 1ᵛ

tactic: refine (map_equiv_traceDual A K _).trans ?_
state_before: case e_a
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝² : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this✝¹ : IsSeparable (FractionRing A) (FractionRing B)
this✝ : FiniteDimensional (FractionRing A) (FractionRing B)
this : Algebra.IsIntegral A B
⊢ Submodule.map (↑(FractionRing.algEquiv B L)).toLinearMap (traceDual A (FractionRing A) 1) = 1ᵛ
state_after: case e_a
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝² : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this✝¹ : IsSeparable (FractionRing A) (FractionRing B)
this✝ : FiniteDimensional (FractionRing A) (FractionRing B)
this : Algebra.IsIntegral A B
⊢ (Submodule.map (FractionRing.algEquiv B L) 1)ᵛ = 1ᵛ

tactic: congr 1
state_before: case e_a
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝² : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this✝¹ : IsSeparable (FractionRing A) (FractionRing B)
this✝ : FiniteDimensional (FractionRing A) (FractionRing B)
this : Algebra.IsIntegral A B
⊢ (Submodule.map (FractionRing.algEquiv B L) 1)ᵛ = 1ᵛ
state_after: case e_a.e_I
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝² : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this✝¹ : IsSeparable (FractionRing A) (FractionRing B)
this✝ : FiniteDimensional (FractionRing A) (FractionRing B)
this : Algebra.IsIntegral A B
⊢ Submodule.map (FractionRing.algEquiv B L) 1 = 1

tactic: ext
state_before: case e_a.e_I
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝² : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this✝¹ : IsSeparable (FractionRing A) (FractionRing B)
this✝ : FiniteDimensional (FractionRing A) (FractionRing B)
this : Algebra.IsIntegral A B
⊢ Submodule.map (FractionRing.algEquiv B L) 1 = 1
state_after: case e_a.e_I.h
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝² : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this✝¹ : IsSeparable (FractionRing A) (FractionRing B)
this✝ : FiniteDimensional (FractionRing A) (FractionRing B)
this : Algebra.IsIntegral A B
x✝ : L
⊢ x✝ ∈ Submodule.map (FractionRing.algEquiv B L) 1 ↔ x✝ ∈ 1

tactic: simp
state_before: case e_a.e_I.h
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this✝² : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
H :
  (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
this✝¹ : IsSeparable (FractionRing A) (FractionRing B)
this✝ : FiniteDimensional (FractionRing A) (FractionRing B)
this : Algebra.IsIntegral A B
x✝ : L
⊢ x✝ ∈ Submodule.map (FractionRing.algEquiv B L) 1 ↔ x✝ ∈ 1
state_after: no goals

tactic: ext
state_before: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
⊢ ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
state_after: case h
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
⊢ (↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B)) 1 = (Algebra.linearMap B L) 1

tactic: simp
state_before: case h
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
⊢ (↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B)) 1 = (Algebra.linearMap B L) 1
state_after: no goals

tactic: apply IsLocalization.ringHom_ext A⁰
state_before: A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
⊢ (algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv =
    (↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)
state_after: case h
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
⊢ ((algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv).comp
      (algebraMap A K) =
    ((↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)).comp (algebraMap A K)

tactic: ext
state_before: case h
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
⊢ ((algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv).comp
      (algebraMap A K) =
    ((↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)).comp (algebraMap A K)
state_after: case h.a
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
x✝ : A
⊢ (((algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv).comp
        (algebraMap A K))
      x✝ =
    (((↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)).comp (algebraMap A K)) x✝

tactic: simp only [AlgEquiv.toRingEquiv_eq_coe, RingHom.coe_comp, RingHom.coe_coe,
  AlgEquiv.coe_ringEquiv, Function.comp_apply, AlgEquiv.commutes,
  ← IsScalarTower.algebraMap_apply]
state_before: case h.a
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
x✝ : A
⊢ (((algebraMap (FractionRing A) (FractionRing B)).comp ↑(FractionRing.algEquiv A K).symm.toRingEquiv).comp
        (algebraMap A K))
      x✝ =
    (((↑(FractionRing.algEquiv B L).symm.toRingEquiv).comp (algebraMap K L)).comp (algebraMap A K)) x✝
state_after: case h.a
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
x✝ : A
⊢ (algebraMap A (FractionRing B)) x✝ = (FractionRing.algEquiv B L).symm ((algebraMap A L) x✝)

tactic: rw [IsScalarTower.algebraMap_apply A B L, AlgEquiv.commutes, ← IsScalarTower.algebraMap_apply]
state_before: case h.a
A : Type u_1
K : Type u_2
L : Type u
B : Type u_3
inst✝²⁰ : CommRing A
inst✝¹⁹ : Field K
inst✝¹⁸ : CommRing B
inst✝¹⁷ : Field L
inst✝¹⁶ : Algebra A K
inst✝¹⁵ : Algebra B L
inst✝¹⁴ : Algebra A B
inst✝¹³ : Algebra K L
inst✝¹² : Algebra A L
inst✝¹¹ : IsScalarTower A K L
inst✝¹⁰ : IsScalarTower A B L
inst✝⁹ : IsDomain A
inst✝⁸ : IsDomain B
inst✝⁷ : IsFractionRing A K
inst✝⁶ : IsIntegralClosure B A L
inst✝⁵ : IsFractionRing B L
inst✝⁴ : FiniteDimensional K L
inst✝³ : IsSeparable K L
inst✝² : IsIntegrallyClosed A
inst✝¹ : IsDedekindDomain B
inst✝ : NoZeroSMulDivisors A B
this : ↑(FractionRing.algEquiv B L).toLinearEquiv ∘ₗ Algebra.linearMap B (FractionRing B) = Algebra.linearMap B L
x✝ : A
⊢ (algebraMap A (FractionRing B)) x✝ = (FractionRing.algEquiv B L).symm ((algebraMap A L) x✝)
state_after: no goals