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theorem proved term proof

harmonic4_matches

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formal statement (Lean)

 201theorem harmonic4_matches : |schumannRS 4 - 27.3| < 0.03 := by

proof body

Term-mode proof.

 202  rw [harmonic4_eq, abs_lt]
 203  exact ⟨by nlinarith [phi_gt_1618], by nlinarith [phi_lt_1619]⟩
 204
 205/-- f(5) = 19φ + 3 ∈ (33.742, 33.761): matches measured 33.8 Hz within 0.06 Hz. -/

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