theorem extracted_formal_statement_409.{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} (fullrank₁ : Function.Injective ⇑(OptProblem.A₁ E₂))
  (fullrank₂ : Function.Injective ⇑(OptProblem.A₂ E₁)) [inst_9 : Setting E₁ E₂ F admm (admm_kkt₁ fullrank₁ fullrank₂)]
  (hτ : ADMM.τ E₁ E₂ F > 0) (hτ' : ADMM.τ E₁ E₂ F ≥ 0)
  (h1 : ∀ (n : ℕ), 1 / ADMM.ρ E₁ E₂ F * Φ n = (ADMM.ρ E₁ E₂ F)⁻¹ * Φ n)
  (open_Φ :
    ∀ (n : ℕ),
      (ADMM.ρ E₁ E₂ F)⁻¹ * Φ n =
        (ADMM.ρ E₁ E₂ F)⁻¹ ^ 2 * (ADMM.τ E₁ E₂ F)⁻¹ * ‖ey n‖ ^ 2 + ‖(OptProblem.A₂ E₁) (e₂ n)‖ ^ 2 +
          ((1 - ADMM.τ E₁ E₂ F) ⊔ (1 - 1 / ADMM.τ E₁ E₂ F)) *
            ‖(OptProblem.A₁ E₂) (e₁ n) + (OptProblem.A₂ E₁) (e₂ n)‖ ^ 2)
  (open_Φ' :
    ∀ (n : ℕ),
      (ADMM.ρ E₁ E₂ F)⁻¹ ^ 2 * (ADMM.τ E₁ E₂ F)⁻¹ * ‖ey n‖ ^ 2 + ‖(OptProblem.A₂ E₁) (e₂ n)‖ ^ 2 +
          ((1 - ADMM.τ E₁ E₂ F) ⊔ (1 - 1 / ADMM.τ E₁ E₂ F)) *
            ‖(OptProblem.A₁ E₂) (e₁ n) + (OptProblem.A₂ E₁) (e₂ n)‖ ^ 2 =
        ‖(OptProblem.A₂ E₁) (e₂ n)‖ ^ 2 +
          ((ADMM.ρ E₁ E₂ F)⁻¹ ^ 2 * (ADMM.τ E₁ E₂ F)⁻¹ * ‖ey n‖ ^ 2 +
            ((1 - ADMM.τ E₁ E₂ F) ⊔ (1 - 1 / ADMM.τ E₁ E₂ F)) *
              ‖(OptProblem.A₁ E₂) (e₁ n) + (OptProblem.A₂ E₁) (e₂ n)‖ ^ 2))
  (nonneg1 : ∀ (n : ℕ), (ADMM.ρ E₁ E₂ F)⁻¹ ^ 2 * (ADMM.τ E₁ E₂ F)⁻¹ * ‖ey n‖ ^ 2 ≥ 0) (n : ℕ)
  (h3 : (1 - ADMM.τ E₁ E₂ F) ⊔ (1 - 1 / ADMM.τ E₁ E₂ F) ≥ 0) :
  0 ≤ ‖(OptProblem.A₁ E₂) (e₁ n) + (OptProblem.A₂ E₁) (e₂ n)‖ ^ 2 := 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
fullrank₁ : Function.Injective ⇑(OptProblem.A₁ E₂)
fullrank₂ : Function.Injective ⇑(OptProblem.A₂ E₁)
n✝ : ℕ
inst✝ : Setting E₁ E₂ F admm (admm_kkt₁ fullrank₁ fullrank₂)
hτ : ADMM.τ E₁ E₂ F > 0
hτ' : ADMM.τ E₁ E₂ F ≥ 0
h1 : ∀ (n : ℕ), 1 / ADMM.ρ E₁ E₂ F * Φ n = (ADMM.ρ E₁ E₂ F)⁻¹ * Φ n
open_Φ :
  ∀ (n : ℕ),
    (ADMM.ρ E₁ E₂ F)⁻¹ * Φ n =
      (ADMM.ρ E₁ E₂ F)⁻¹ ^ 2 * (ADMM.τ E₁ E₂ F)⁻¹ * ‖ey n‖ ^ 2 + ‖(OptProblem.A₂ E₁) (e₂ n)‖ ^ 2 +
        ((1 - ADMM.τ E₁ E₂ F) ⊔ (1 - 1 / ADMM.τ E₁ E₂ F)) * ‖(OptProblem.A₁ E₂) (e₁ n) + (OptProblem.A₂ E₁) (e₂ n)‖ ^ 2
open_Φ' :
  ∀ (n : ℕ),
    (ADMM.ρ E₁ E₂ F)⁻¹ ^ 2 * (ADMM.τ E₁ E₂ F)⁻¹ * ‖ey n‖ ^ 2 + ‖(OptProblem.A₂ E₁) (e₂ n)‖ ^ 2 +
        ((1 - ADMM.τ E₁ E₂ F) ⊔ (1 - 1 / ADMM.τ E₁ E₂ F)) *
          ‖(OptProblem.A₁ E₂) (e₁ n) + (OptProblem.A₂ E₁) (e₂ n)‖ ^ 2 =
      ‖(OptProblem.A₂ E₁) (e₂ n)‖ ^ 2 +
        ((ADMM.ρ E₁ E₂ F)⁻¹ ^ 2 * (ADMM.τ E₁ E₂ F)⁻¹ * ‖ey n‖ ^ 2 +
          ((1 - ADMM.τ E₁ E₂ F) ⊔ (1 - 1 / ADMM.τ E₁ E₂ F)) *
            ‖(OptProblem.A₁ E₂) (e₁ n) + (OptProblem.A₂ E₁) (e₂ n)‖ ^ 2)
nonneg1 : ∀ (n : ℕ), (ADMM.ρ E₁ E₂ F)⁻¹ ^ 2 * (ADMM.τ E₁ E₂ F)⁻¹ * ‖ey n‖ ^ 2 ≥ 0
n : ℕ
h3 : (1 - ADMM.τ E₁ E₂ F) ⊔ (1 - 1 / ADMM.τ E₁ E₂ F) ≥ 0
⊢ 0 ≤ ‖(OptProblem.A₁ E₂) (e₁ n) + (OptProblem.A₂ E₁) (e₂ n)‖ ^ 2

Tactic: apply pow_two_nonneg

State after:

Relevant lemmas:
pow_two_nonneg : ∀ {α : Type u} [inst : Semiring α] [inst_10 : LinearOrder α] [inst_11 : IsRightCancelAdd α]
  [inst_12 : ZeroLEOneClass α] [inst_13 : ExistsAddOfLE α] [inst_14 : PosMulMono α] [inst_15 : AddLeftStrictMono α]
  (a : α), 0 ≤ a ^ 2