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theorem proved tactic proof

selfSimilarityDefect_phi

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formal statement (Lean)

  36theorem selfSimilarityDefect_phi : selfSimilarityDefect phi = 1 := by

proof body

Tactic-mode proof.

  37  unfold selfSimilarityDefect
  38  have hphi1 : phi + 1 ≠ 0 := by linarith [phi_pos]
  39  rw [phi_sq_eq]
  40  field_simp [hphi1]
  41

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