theorem extracted_formal_statement_56.{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} (n : ℕ+) :
  let c := (OptProblem.A₂ E₁) (ADMM.x₂ E₁ F n.natPred) - OptProblem.b E₁ E₂;
  ((fun x =>
        ADMM.ρ E₁ E₂ F / 2 *
          ‖(OptProblem.A₁ E₂) x + (OptProblem.A₂ E₁) (ADMM.x₂ E₁ F n.natPred) - OptProblem.b E₁ E₂‖ ^ 2) =
      fun x =>
      ADMM.ρ E₁ E₂ F / 2 *
        ‖(OptProblem.A₁ E₂) x + ((OptProblem.A₂ E₁) (ADMM.x₂ E₁ F n.natPred) - OptProblem.b E₁ E₂)‖ ^ 2) →
    ((fun x => ADMM.ρ E₁ E₂ F / 2 * ‖(OptProblem.A₁ E₂) x + c‖ ^ 2) = fun x =>
        ADMM.ρ E₁ E₂ F / 2 *
          (⟪(OptProblem.A₁ E₂) x, (OptProblem.A₁ E₂) x⟫_ℝ + 2 * ⟪c, (OptProblem.A₁ E₂) x⟫_ℝ + ⟪c, c⟫_ℝ)) →
      ADMM.ρ E₁ E₂ F • (ContinuousLinearMap.adjoint (OptProblem.A₁ E₂)) ((OptProblem.A₁ E₂) (ADMM.x₁ E₂ F ↑n) + c) =
        (ADMM.ρ E₁ E₂ F / 2 * 2) •
          (ContinuousLinearMap.adjoint (OptProblem.A₁ E₂)) ((OptProblem.A₁ E₂) (ADMM.x₁ E₂ F ↑n) + c) := 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+
c : F := (OptProblem.A₂ E₁) (ADMM.x₂ E₁ F n.natPred) - OptProblem.b E₁ E₂
h1 :
  (fun x =>
      ADMM.ρ E₁ E₂ F / 2 *
        ‖(OptProblem.A₁ E₂) x + (OptProblem.A₂ E₁) (ADMM.x₂ E₁ F n.natPred) - OptProblem.b E₁ E₂‖ ^ 2) =
    fun x =>
    ADMM.ρ E₁ E₂ F / 2 * ‖(OptProblem.A₁ E₂) x + ((OptProblem.A₂ E₁) (ADMM.x₂ E₁ F n.natPred) - OptProblem.b E₁ E₂)‖ ^ 2
h2 :
  (fun x => ADMM.ρ E₁ E₂ F / 2 * ‖(OptProblem.A₁ E₂) x + c‖ ^ 2) = fun x =>
    ADMM.ρ E₁ E₂ F / 2 * (⟪(OptProblem.A₁ E₂) x, (OptProblem.A₁ E₂) x⟫_ℝ + 2 * ⟪c, (OptProblem.A₁ E₂) x⟫_ℝ + ⟪c, c⟫_ℝ)
⊢ ADMM.ρ E₁ E₂ F • (ContinuousLinearMap.adjoint (OptProblem.A₁ E₂)) ((OptProblem.A₁ E₂) (ADMM.x₁ E₂ F ↑n) + c) =
    (ADMM.ρ E₁ E₂ F / 2 * 2) •
      (ContinuousLinearMap.adjoint (OptProblem.A₁ E₂)) ((OptProblem.A₁ E₂) (ADMM.x₁ E₂ F ↑n) + c)

Tactic: simp only [map_add, smul_add, isUnit_iff_ne_zero, ne_eq, OfNat.ofNat_ne_zero, not_false_eq_true,
  IsUnit.div_mul_cancel]

State after:

Relevant lemmas:
map_add : ∀ {M : Type u_4} {N : Type u_5} {F : Type u_9} [inst : Add M] [inst_9 : Add N] [inst_10 : FunLike F M N]
  [inst_11 : AddHomClass F M N] (f : F) (x y : M), f (x + y) = f x + f y
OfNat.ofNat_ne_zero : ∀ {R : Type u_1} [inst : AddMonoidWithOne R] [inst_9 : CharZero R] (n : ℕ)
  [inst_10 : n.AtLeastTwo], OfNat.ofNat n ≠ 0
ne_eq : ∀ {α : Sort u_1} (a b : α), (a ≠ b) = ¬a = b
IsUnit.div_mul_cancel : ∀ {α : Type u} [inst : DivisionMonoid α] {b : α}, IsUnit b → ∀ (a : α), a / b * b = a
not_false_eq_true : (¬False) = True
isUnit_iff_ne_zero : ∀ {G₀ : Type u_3} [inst : GroupWithZero G₀] {a : G₀}, IsUnit a ↔ a ≠ 0
smul_add : ∀ {M : Type u_1} {A : Type u_7} [inst : AddZeroClass A] [inst_9 : DistribSMul M A] (a : M) (b₁ b₂ : A),
  a • (b₁ + b₂) = a • b₁ + a • b₂