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lemma proved tactic proof

log_one_add_inv_phi_eq_log_phi

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formal statement (Lean)

  57lemma log_one_add_inv_phi_eq_log_phi : Real.log (1 + phi⁻¹) = Real.log phi := by

proof body

Tactic-mode proof.

  58  have hshift : (1 + phi⁻¹ : ℝ) = phi := by
  59    simpa [one_div] using one_add_inv_phi_eq_phi
  60  simp [hshift]
  61
  62/-! ## Step 1: g(0) = 0 forces c = 0 -/
  63

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