Theorem: ContinuousMultilinearMap.norm_compContinuous_linearIsometryEquiv
File: Mathlib/Analysis/NormedSpace/Multilinear.lean

tactic: apply le_antisymm (g.norm_compContinuous_linearIsometry_le fun i => (f i).toLinearIsometry)
state_before: 𝕜 : Type u
ι : Type v
ι' : Type v'
n : ℕ
E : ι → Type wE
E₁ : ι → Type wE₁
E' : ι' → Type wE'
Ei : Fin (Nat.succ n) → Type wEi
G : Type wG
G' : Type wG'
inst✝¹⁴ : Fintype ι
inst✝¹³ : Fintype ι'
inst✝¹² : NontriviallyNormedField 𝕜
inst✝¹¹ : (i : ι) → NormedAddCommGroup (E i)
inst✝¹⁰ : (i : ι) → NormedSpace 𝕜 (E i)
inst✝⁹ : (i : ι) → NormedAddCommGroup (E₁ i)
inst✝⁸ : (i : ι) → NormedSpace 𝕜 (E₁ i)
inst✝⁷ : (i : ι') → NormedAddCommGroup (E' i)
inst✝⁶ : (i : ι') → NormedSpace 𝕜 (E' i)
inst✝⁵ : (i : Fin (Nat.succ n)) → NormedAddCommGroup (Ei i)
inst✝⁴ : (i : Fin (Nat.succ n)) → NormedSpace 𝕜 (Ei i)
inst✝³ : NormedAddCommGroup G
inst✝² : NormedSpace 𝕜 G
inst✝¹ : NormedAddCommGroup G'
inst✝ : NormedSpace 𝕜 G'
g : ContinuousMultilinearMap 𝕜 E₁ G
f : (i : ι) → E i ≃ₗᵢ[𝕜] E₁ i
⊢ ‖compContinuousLinearMap g fun i => ↑(ContinuousLinearEquiv.mk (f i).toLinearEquiv)‖ = ‖g‖

tactic: have : g = (g.compContinuousLinearMap fun i => (f i : E i →L[𝕜] E₁ i)).compContinuousLinearMap
    fun i => ((f i).symm : E₁ i →L[𝕜] E i) := by
  ext1 m
  simp only [compContinuousLinearMap_apply, LinearIsometryEquiv.coe_coe'',
    LinearIsometryEquiv.apply_symm_apply]
state_before: 𝕜 : Type u
ι : Type v
ι' : Type v'
n : ℕ
E : ι → Type wE
E₁ : ι → Type wE₁
E' : ι' → Type wE'
Ei : Fin (Nat.succ n) → Type wEi
G : Type wG
G' : Type wG'
inst✝¹⁴ : Fintype ι
inst✝¹³ : Fintype ι'
inst✝¹² : NontriviallyNormedField 𝕜
inst✝¹¹ : (i : ι) → NormedAddCommGroup (E i)
inst✝¹⁰ : (i : ι) → NormedSpace 𝕜 (E i)
inst✝⁹ : (i : ι) → NormedAddCommGroup (E₁ i)
inst✝⁸ : (i : ι) → NormedSpace 𝕜 (E₁ i)
inst✝⁷ : (i : ι') → NormedAddCommGroup (E' i)
inst✝⁶ : (i : ι') → NormedSpace 𝕜 (E' i)
inst✝⁵ : (i : Fin (Nat.succ n)) → NormedAddCommGroup (Ei i)
inst✝⁴ : (i : Fin (Nat.succ n)) → NormedSpace 𝕜 (Ei i)
inst✝³ : NormedAddCommGroup G
inst✝² : NormedSpace 𝕜 G
inst✝¹ : NormedAddCommGroup G'
inst✝ : NormedSpace 𝕜 G'
g : ContinuousMultilinearMap 𝕜 E₁ G
f : (i : ι) → E i ≃ₗᵢ[𝕜] E₁ i
⊢ ‖g‖ ≤
    ‖compContinuousLinearMap g fun i =>
        LinearIsometry.toContinuousLinearMap (LinearIsometryEquiv.toLinearIsometry (f i))‖

tactic: conv_lhs => rw [this]
state_before: 𝕜 : Type u
ι : Type v
ι' : Type v'
n : ℕ
E : ι → Type wE
E₁ : ι → Type wE₁
E' : ι' → Type wE'
Ei : Fin (Nat.succ n) → Type wEi
G : Type wG
G' : Type wG'
inst✝¹⁴ : Fintype ι
inst✝¹³ : Fintype ι'
inst✝¹² : NontriviallyNormedField 𝕜
inst✝¹¹ : (i : ι) → NormedAddCommGroup (E i)
inst✝¹⁰ : (i : ι) → NormedSpace 𝕜 (E i)
inst✝⁹ : (i : ι) → NormedAddCommGroup (E₁ i)
inst✝⁸ : (i : ι) → NormedSpace 𝕜 (E₁ i)
inst✝⁷ : (i : ι') → NormedAddCommGroup (E' i)
inst✝⁶ : (i : ι') → NormedSpace 𝕜 (E' i)
inst✝⁵ : (i : Fin (Nat.succ n)) → NormedAddCommGroup (Ei i)
inst✝⁴ : (i : Fin (Nat.succ n)) → NormedSpace 𝕜 (Ei i)
inst✝³ : NormedAddCommGroup G
inst✝² : NormedSpace 𝕜 G
inst✝¹ : NormedAddCommGroup G'
inst✝ : NormedSpace 𝕜 G'
g : ContinuousMultilinearMap 𝕜 E₁ G
f : (i : ι) → E i ≃ₗᵢ[𝕜] E₁ i
this :
  g =
    compContinuousLinearMap (compContinuousLinearMap g fun i => ↑(ContinuousLinearEquiv.mk (f i).toLinearEquiv))
      fun i => ↑(ContinuousLinearEquiv.mk (LinearIsometryEquiv.symm (f i)).toLinearEquiv)
⊢ ‖g‖ ≤
    ‖compContinuousLinearMap g fun i =>
        LinearIsometry.toContinuousLinearMap (LinearIsometryEquiv.toLinearIsometry (f i))‖

tactic: apply (g.compContinuousLinearMap fun i =>
  (f i : E i →L[𝕜] E₁ i)).norm_compContinuous_linearIsometry_le
    fun i => (f i).symm.toLinearIsometry
state_before: 𝕜 : Type u
ι : Type v
ι' : Type v'
n : ℕ
E : ι → Type wE
E₁ : ι → Type wE₁
E' : ι' → Type wE'
Ei : Fin (Nat.succ n) → Type wEi
G : Type wG
G' : Type wG'
inst✝¹⁴ : Fintype ι
inst✝¹³ : Fintype ι'
inst✝¹² : NontriviallyNormedField 𝕜
inst✝¹¹ : (i : ι) → NormedAddCommGroup (E i)
inst✝¹⁰ : (i : ι) → NormedSpace 𝕜 (E i)
inst✝⁹ : (i : ι) → NormedAddCommGroup (E₁ i)
inst✝⁸ : (i : ι) → NormedSpace 𝕜 (E₁ i)
inst✝⁷ : (i : ι') → NormedAddCommGroup (E' i)
inst✝⁶ : (i : ι') → NormedSpace 𝕜 (E' i)
inst✝⁵ : (i : Fin (Nat.succ n)) → NormedAddCommGroup (Ei i)
inst✝⁴ : (i : Fin (Nat.succ n)) → NormedSpace 𝕜 (Ei i)
inst✝³ : NormedAddCommGroup G
inst✝² : NormedSpace 𝕜 G
inst✝¹ : NormedAddCommGroup G'
inst✝ : NormedSpace 𝕜 G'
g : ContinuousMultilinearMap 𝕜 E₁ G
f : (i : ι) → E i ≃ₗᵢ[𝕜] E₁ i
this :
  g =
    compContinuousLinearMap (compContinuousLinearMap g fun i => ↑(ContinuousLinearEquiv.mk (f i).toLinearEquiv))
      fun i => ↑(ContinuousLinearEquiv.mk (LinearIsometryEquiv.symm (f i)).toLinearEquiv)
⊢ ‖compContinuousLinearMap (compContinuousLinearMap g fun i => ↑(ContinuousLinearEquiv.mk (f i).toLinearEquiv)) fun i =>
        ↑(ContinuousLinearEquiv.mk (LinearIsometryEquiv.symm (f i)).toLinearEquiv)‖ ≤
    ‖compContinuousLinearMap g fun i =>
        LinearIsometry.toContinuousLinearMap (LinearIsometryEquiv.toLinearIsometry (f i))‖

tactic: ext1 m
state_before: 𝕜 : Type u
ι : Type v
ι' : Type v'
n : ℕ
E : ι → Type wE
E₁ : ι → Type wE₁
E' : ι' → Type wE'
Ei : Fin (Nat.succ n) → Type wEi
G : Type wG
G' : Type wG'
inst✝¹⁴ : Fintype ι
inst✝¹³ : Fintype ι'
inst✝¹² : NontriviallyNormedField 𝕜
inst✝¹¹ : (i : ι) → NormedAddCommGroup (E i)
inst✝¹⁰ : (i : ι) → NormedSpace 𝕜 (E i)
inst✝⁹ : (i : ι) → NormedAddCommGroup (E₁ i)
inst✝⁸ : (i : ι) → NormedSpace 𝕜 (E₁ i)
inst✝⁷ : (i : ι') → NormedAddCommGroup (E' i)
inst✝⁶ : (i : ι') → NormedSpace 𝕜 (E' i)
inst✝⁵ : (i : Fin (Nat.succ n)) → NormedAddCommGroup (Ei i)
inst✝⁴ : (i : Fin (Nat.succ n)) → NormedSpace 𝕜 (Ei i)
inst✝³ : NormedAddCommGroup G
inst✝² : NormedSpace 𝕜 G
inst✝¹ : NormedAddCommGroup G'
inst✝ : NormedSpace 𝕜 G'
g : ContinuousMultilinearMap 𝕜 E₁ G
f : (i : ι) → E i ≃ₗᵢ[𝕜] E₁ i
⊢ g =
    compContinuousLinearMap (compContinuousLinearMap g fun i => ↑(ContinuousLinearEquiv.mk (f i).toLinearEquiv))
      fun i => ↑(ContinuousLinearEquiv.mk (LinearIsometryEquiv.symm (f i)).toLinearEquiv)

tactic: simp only [compContinuousLinearMap_apply, LinearIsometryEquiv.coe_coe'',
  LinearIsometryEquiv.apply_symm_apply]
state_before: case H
𝕜 : Type u
ι : Type v
ι' : Type v'
n : ℕ
E : ι → Type wE
E₁ : ι → Type wE₁
E' : ι' → Type wE'
Ei : Fin (Nat.succ n) → Type wEi
G : Type wG
G' : Type wG'
inst✝¹⁴ : Fintype ι
inst✝¹³ : Fintype ι'
inst✝¹² : NontriviallyNormedField 𝕜
inst✝¹¹ : (i : ι) → NormedAddCommGroup (E i)
inst✝¹⁰ : (i : ι) → NormedSpace 𝕜 (E i)
inst✝⁹ : (i : ι) → NormedAddCommGroup (E₁ i)
inst✝⁸ : (i : ι) → NormedSpace 𝕜 (E₁ i)
inst✝⁷ : (i : ι') → NormedAddCommGroup (E' i)
inst✝⁶ : (i : ι') → NormedSpace 𝕜 (E' i)
inst✝⁵ : (i : Fin (Nat.succ n)) → NormedAddCommGroup (Ei i)
inst✝⁴ : (i : Fin (Nat.succ n)) → NormedSpace 𝕜 (Ei i)
inst✝³ : NormedAddCommGroup G
inst✝² : NormedSpace 𝕜 G
inst✝¹ : NormedAddCommGroup G'
inst✝ : NormedSpace 𝕜 G'
g : ContinuousMultilinearMap 𝕜 E₁ G
f : (i : ι) → E i ≃ₗᵢ[𝕜] E₁ i
m : (i : ι) → E₁ i
⊢ ↑g m =
    ↑(compContinuousLinearMap (compContinuousLinearMap g fun i => ↑(ContinuousLinearEquiv.mk (f i).toLinearEquiv))
          fun i => ↑(ContinuousLinearEquiv.mk (LinearIsometryEquiv.symm (f i)).toLinearEquiv))
      m