theorem extracted_formal_statement_118.{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) :
  let x1 := 1 / (ADMM.τ E₁ E₂ F * ADMM.ρ E₁ E₂ F) * ‖ey n‖ ^ 2;
  0 ≤ x1 →
    let x2 := ADMM.ρ E₁ E₂ F * ‖(OptProblem.A₂ E₁) (e₂ n)‖ ^ 2;
    0 ≤ x2 →
      let x3 :=
        ((1 - ADMM.τ E₁ E₂ F) ⊔ (1 - 1 / ADMM.τ E₁ E₂ F)) * ADMM.ρ E₁ E₂ F *
          ‖(OptProblem.A₁ E₂) (e₁ n) + (OptProblem.A₂ E₁) (e₂ n)‖ ^ 2;
      0 ≤ x3 →
        (ADMM.ρ E₁ E₂ F * ‖(OptProblem.A₂ E₁) (e₂ n)‖ ^ 2 ≤ ‖Φ n‖ ↔ x2 ≤ ‖x1 + x2 + x3‖) →
          0 ≤ ‖x1 + x2 + x3‖ → ‖x1 + x2 + x3‖ = x1 + x2 + x3 → 0 ≤ x1 + x2 + x3 := 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
x1 : ℝ := 1 / (ADMM.τ E₁ E₂ F * ADMM.ρ E₁ E₂ F) * ‖ey n‖ ^ 2
hx1 : 0 ≤ x1
x2 : ℝ := ADMM.ρ E₁ E₂ F * ‖(OptProblem.A₂ E₁) (e₂ n)‖ ^ 2
hx2 : 0 ≤ x2
x3 : ℝ :=
  ((1 - ADMM.τ E₁ E₂ F) ⊔ (1 - 1 / ADMM.τ E₁ E₂ F)) * ADMM.ρ E₁ E₂ F *
    ‖(OptProblem.A₁ E₂) (e₁ n) + (OptProblem.A₂ E₁) (e₂ n)‖ ^ 2
hx3 : 0 ≤ x3
h : ADMM.ρ E₁ E₂ F * ‖(OptProblem.A₂ E₁) (e₂ n)‖ ^ 2 ≤ ‖Φ n‖ ↔ x2 ≤ ‖x1 + x2 + x3‖
h_norm_pos : 0 ≤ ‖x1 + x2 + x3‖
⊢ ‖x1 + x2 + x3‖ = x1 + x2 + x3

Tactic: rw [Real.norm_of_nonneg]

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
 x1 : ℝ := 1 / (ADMM.τ E₁ E₂ F * ADMM.ρ E₁ E₂ F) * ‖ey n‖ ^ 2
 hx1 : 0 ≤ x1
 x2 : ℝ := ADMM.ρ E₁ E₂ F * ‖(OptProblem.A₂ E₁) (e₂ n)‖ ^ 2
 hx2 : 0 ≤ x2
 x3 : ℝ :=
   ((1 - ADMM.τ E₁ E₂ F) ⊔ (1 - 1 / ADMM.τ E₁ E₂ F)) * ADMM.ρ E₁ E₂ F *
     ‖(OptProblem.A₁ E₂) (e₁ n) + (OptProblem.A₂ E₁) (e₂ n)‖ ^ 2
 hx3 : 0 ≤ x3
 h : ADMM.ρ E₁ E₂ F * ‖(OptProblem.A₂ E₁) (e₂ n)‖ ^ 2 ≤ ‖Φ n‖ ↔ x2 ≤ ‖x1 + x2 + x3‖
 h_norm_pos : 0 ≤ ‖x1 + x2 + x3‖
 ⊢ 0 ≤ x1 + x2 + x3]

Relevant lemmas:
Real.norm_of_nonneg : ∀ {r : ℝ}, 0 ≤ r → ‖r‖ = r