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theorem proved term proof

codeThreshold_decay

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formal statement (Lean)

  36theorem codeThreshold_decay (k : ℕ) :
  37    codeThreshold (k + 1) / codeThreshold k = phi⁻¹ := by

proof body

Term-mode proof.

  38  unfold codeThreshold
  39  have hk := (pow_pos phi_pos k).ne'
  40  rw [pow_succ, mul_inv]
  41  field_simp [hk, phi_ne_zero]
  42

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