theorem extracted_formal_statement_38.{u_3, u_2, u_1} {E₁ : Type u_1} {E₂ : Type u_2} {F : Type u_3}
  [inst : NormedAddCommGroup E₁] [inst_1 : InnerProductSpace ℝ E₁] [inst_2 : FiniteDimensional ℝ E₁]
  [inst_3 : NormedAddCommGroup E₂] [inst_4 : InnerProductSpace ℝ E₂] [inst_5 : FiniteDimensional ℝ E₂]
  [inst_6 : NormedAddCommGroup F] [inst_7 : InnerProductSpace ℝ F] [inst_8 : FiniteDimensional ℝ F]
  {admm : ADMM E₁ E₂ F} {admm_kkt : Existance_of_kkt admm} [inst_9 : Setting E₁ E₂ F admm admm_kkt] (n : ℕ+)
  (h_original_goal :
    -(ContinuousLinearMap.adjoint (OptProblem.A₂ E₁)) (υ ↑n) ∈ SubderivAt (OptProblem.f₂ E₁ F) (ADMM.x₂ E₁ F ↑n)) :
  v ↑n ∈ SubderivAt (OptProblem.f₂ E₁ F) (ADMM.x₂ E₁ F ↑n) := sorry

State before:
E₁ : Type u_1
E₂ : Type u_2
F : Type u_3
inst✝⁹ : NormedAddCommGroup E₁
inst✝⁸ : InnerProductSpace ℝ E₁
inst✝⁷ : FiniteDimensional ℝ E₁
inst✝⁶ : NormedAddCommGroup E₂
inst✝⁵ : InnerProductSpace ℝ E₂
inst✝⁴ : FiniteDimensional ℝ E₂
inst✝³ : NormedAddCommGroup F
inst✝² : InnerProductSpace ℝ F
inst✝¹ : FiniteDimensional ℝ F
admm : ADMM E₁ E₂ F
admm_kkt : Existance_of_kkt admm
inst✝ : Setting E₁ E₂ F admm admm_kkt
n : ℕ+
⊢ -(ContinuousLinearMap.adjoint (OptProblem.A₂ E₁)) (υ ↑n) ∈ SubderivAt (OptProblem.f₂ E₁ F) (ADMM.x₂ E₁ F ↑n)

Tactic: rw [υ]
    have : v n = -A₂† (y n + ((1 - τ) * ρ) • (A₁ (e₁ n) + A₂ (e₂ n))) := rfl
    rw [Φ_isdescending_eq3', ← this]

State after:
[E₁ : Type u_1
 E₂ : Type u_2
 F : Type u_3
 inst✝⁹ : NormedAddCommGroup E₁
 inst✝⁸ : InnerProductSpace ℝ E₁
 inst✝⁷ : FiniteDimensional ℝ E₁
 inst✝⁶ : NormedAddCommGroup E₂
 inst✝⁵ : InnerProductSpace ℝ E₂
 inst✝⁴ : FiniteDimensional ℝ E₂
 inst✝³ : NormedAddCommGroup F
 inst✝² : InnerProductSpace ℝ F
 inst✝¹ : FiniteDimensional ℝ F
 admm : ADMM E₁ E₂ F
 admm_kkt : Existance_of_kkt admm
 inst✝ : Setting E₁ E₂ F admm admm_kkt
 n : ℕ+
 this :
   v ↑n =
     -(ContinuousLinearMap.adjoint (OptProblem.A₂ E₁))
         (ADMM.y E₁ E₂ ↑n +
           ((1 - ADMM.τ E₁ E₂ F) * ADMM.ρ E₁ E₂ F) • ((OptProblem.A₁ E₂) (e₁ ↑n) + (OptProblem.A₂ E₁) (e₂ ↑n)))
 ⊢ v ↑n ∈ SubderivAt (OptProblem.f₂ E₁ F) (ADMM.x₂ E₁ F ↑n)]

Relevant lemmas:
error