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theorem proved term proof

three_phi_sq_eq_phi4_plus_1

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formal statement (Lean)

 138theorem three_phi_sq_eq_phi4_plus_1 : 3 * phi ^ 2 = phi ^ 4 + 1 := by

proof body

Term-mode proof.

 139  rw [phi_sq_eq, phi_fourth_eq]; ring
 140
 141/-- The Schumann fundamental equals φ⁴ + 1. -/

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