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theorem proved term proof

log_length_ratio_pos

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formal statement (Lean)

 103theorem log_length_ratio_pos : 0 < Real.log horton_length_ratio := by

proof body

Term-mode proof.

 104  unfold horton_length_ratio
 105  exact Real.log_pos one_lt_phi
 106
 107/-- `log R_b = 2 · log φ > 0`. -/

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depends on (4)

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