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theorem proved term proof

harmonic3_matches

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formal statement (Lean)

 192theorem harmonic3_matches : |schumannRS 3 - 20.8| < 0.01 := by

proof body

Term-mode proof.

 193  rw [harmonic3_eq, abs_lt]
 194  exact ⟨by nlinarith [phi_gt_1618], by nlinarith [phi_lt_1619]⟩
 195
 196/-- f(4) = 15φ + 3 ∈ (27.270, 27.285): matches measured 27.3 Hz within 0.03 Hz. -/

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