-- Lean 4 proof step from Mathlib.Algebra.Symmetrized (goal)
Goal:
α : Type u_1
inst : Ring α
inst_1 : Invertible (α := α) 2
a b : αˢʸᵐ
commute_half_left :
  ∀ (a : α),
    @Invertible.invOf _ MulOne.toMul MulOne.toOne 2 _ * a = a * @Invertible.invOf _ MulOne.toMul MulOne.toOne 2 _
⊢ HMul.hMul (α := α) (@Invertible.invOf _ Distrib.toMul AddMonoidWithOne.toOne 2 _)
        (@Invertible.invOf _ Distrib.toMul AddMonoidWithOne.toOne 2 _) *
      (HMul.hMul (β := α)
                (HMul.hMul (β := α)
                  (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) a : α) ((unsym : (a : αˢʸᵐ) → α) b : α))
                  ((unsym : (a : αˢʸᵐ) → α) a : α))
                ((unsym : (a : αˢʸᵐ) → α) a : α) +
              HMul.hMul (β := α)
                (HMul.hMul (β := α)
                  (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) b : α) ((unsym : (a : αˢʸᵐ) → α) a : α))
                  ((unsym : (a : αˢʸᵐ) → α) a : α))
                ((unsym : (a : αˢʸᵐ) → α) a : α) +
            HMul.hMul (β := α)
              (HMul.hMul (β := α)
                (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) a : α) ((unsym : (a : αˢʸᵐ) → α) a : α))
                ((unsym : (a : αˢʸᵐ) → α) a : α))
              ((unsym : (a : αˢʸᵐ) → α) b : α) +
          HMul.hMul (β := α)
            (HMul.hMul (β := α)
              (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) a : α) ((unsym : (a : αˢʸᵐ) → α) a : α))
              ((unsym : (a : αˢʸᵐ) → α) b : α))
            ((unsym : (a : αˢʸᵐ) → α) a : α) -
        (HMul.hMul (β := α)
                (HMul.hMul (β := α)
                  (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) a : α) ((unsym : (a : αˢʸᵐ) → α) b : α))
                  ((unsym : (a : αˢʸᵐ) → α) a : α))
                ((unsym : (a : αˢʸᵐ) → α) a : α) +
              HMul.hMul (β := α)
                (HMul.hMul (β := α)
                  (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) a : α) ((unsym : (a : αˢʸᵐ) → α) a : α))
                  ((unsym : (a : αˢʸᵐ) → α) a : α))
                ((unsym : (a : αˢʸᵐ) → α) b : α) +
            HMul.hMul (β := α)
              (HMul.hMul (β := α)
                (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) b : α) ((unsym : (a : αˢʸᵐ) → α) a : α))
                ((unsym : (a : αˢʸᵐ) → α) a : α))
              ((unsym : (a : αˢʸᵐ) → α) a : α) +
          HMul.hMul (β := α)
            (HMul.hMul (β := α)
              (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) a : α) ((unsym : (a : αˢʸᵐ) → α) a : α))
              ((unsym : (a : αˢʸᵐ) → α) b : α))
            ((unsym : (a : αˢʸᵐ) → α) a : α))) =
    0
have h : HMul.hMul (β := α)
            (HMul.hMul (β := α)
              (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) a : α) ((unsym : (a : αˢʸᵐ) → α) b : α))
              ((unsym : (a : αˢʸᵐ) → α) a : α))
            ((unsym : (a : αˢʸᵐ) → α) a : α) +
          HMul.hMul (β := α)
            (HMul.hMul (β := α)
              (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) b : α) ((unsym : (a : αˢʸᵐ) → α) a : α))
              ((unsym : (a : αˢʸᵐ) → α) a : α))
            ((unsym : (a : αˢʸᵐ) → α) a : α) +
        HMul.hMul (β := α)
          (HMul.hMul (β := α)
            (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) a : α) ((unsym : (a : αˢʸᵐ) → α) a : α))
            ((unsym : (a : αˢʸᵐ) → α) a : α))
          ((unsym : (a : αˢʸᵐ) → α) b : α) +
      HMul.hMul (β := α)
        (HMul.hMul (β := α)
          (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) a : α) ((unsym : (a : αˢʸᵐ) → α) a : α))
          ((unsym : (a : αˢʸᵐ) → α) b : α))
        ((unsym : (a : αˢʸᵐ) → α) a : α) -
    (HMul.hMul (β := α)
            (HMul.hMul (β := α)
              (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) a : α) ((unsym : (a : αˢʸᵐ) → α) b : α))
              ((unsym : (a : αˢʸᵐ) → α) a : α))
            ((unsym : (a : αˢʸᵐ) → α) a : α) +
          HMul.hMul (β := α)
            (HMul.hMul (β := α)
              (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) a : α) ((unsym : (a : αˢʸᵐ) → α) a : α))
              ((unsym : (a : αˢʸᵐ) → α) a : α))
            ((unsym : (a : αˢʸᵐ) → α) b : α) +
        HMul.hMul (β := α)
          (HMul.hMul (β := α)
            (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) b : α) ((unsym : (a : αˢʸᵐ) → α) a : α))
            ((unsym : (a : αˢʸᵐ) → α) a : α))
          ((unsym : (a : αˢʸᵐ) → α) a : α) +
      HMul.hMul (β := α)
        (HMul.hMul (β := α)
          (HMul.hMul (α := α) (β := α) ((unsym : (a : αˢʸᵐ) → α) a : α) ((unsym : (a : αˢʸᵐ) → α) a : α))
          ((unsym : (a : αˢʸᵐ) → α) b : α))
        ((unsym : (a : αˢʸᵐ) → α) a : α)) =
  0
Tactic: convert! mul_zero (⅟(2 : α) * ⅟(2 : α))