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theorem proved term proof

fundamental_eq_phi4_plus_1

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formal statement (Lean)

 142theorem fundamental_eq_phi4_plus_1 : schumannRS 1 = phi ^ 4 + 1 := by

proof body

Term-mode proof.

 143  rw [harmonic1_eq, ← three_phi_sq_eq_phi4_plus_1, phi_sq_eq]; ring
 144
 145/-- Consecutive Schumann harmonics are spaced by exactly 4φ = (D+1)·φ. -/

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