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theorem proved term proof

mode_seven_lt_9

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formal statement (Lean)

  95theorem mode_seven_lt_9 : harmonicFrequency ⟨7, by decide⟩ < 9 := by

proof body

Term-mode proof.

  96  rw [mode_seven]
  97  have := phi_lt_onePointSixTwo
  98  -- 35φ/8 < 35 · 1.62 / 8 = 56.7/8 = 7.0875 < 9
  99  linarith
 100
 101/-- Strict monotonicity of the comb. -/

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