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theorem proved term proof

phi_interval_contains

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formal statement (Lean)

  47theorem phi_interval_contains :
  48    phiInterval.contains ((1 + Real.sqrt 5) / 2) := phi_in_phiInterval

proof body

Term-mode proof.

  49
  50/-- Prove that log(φ) is in its interval -/

depends on (10)

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