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theorem proved term proof

harmonic2_matches

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formal statement (Lean)

 183theorem harmonic2_matches : |schumannRS 2 - 14.3| < 0.04 := by

proof body

Term-mode proof.

 184  rw [harmonic2_eq, abs_lt]
 185  exact ⟨by nlinarith [phi_gt_1618], by nlinarith [phi_lt_1619]⟩
 186
 187/-- f(3) = 11φ + 3 ∈ (20.798, 20.809): matches measured 20.8 Hz within 0.01 Hz. -/

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