theorem proved term proof

`phiScale_add`

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formal statement (Lean)

  72theorem phiScale_add (m n : ℤ) (x : ℝ) :
  73    phiScale m (phiScale n x) = phiScale (m + n) x := by

Term-mode proof.

  74  simp only [phiScale, mul_assoc]
  75  congr 1
  76  rw [zpow_add₀ (ne_of_gt phi_pos), mul_comm]
  77

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