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theorem proved term proof

fibonacci_mass_recursion

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formal statement (Lean)

 320theorem fibonacci_mass_recursion (y : ℝ) (n : ℕ) :
 321    y * phi ^ (n + 2) = y * phi ^ (n + 1) + y * phi ^ n := by

proof body

Term-mode proof.

 322  rw [phi_fibonacci_recursion]; ring
 323
 324/-- The ratio of consecutive masses = φ. -/

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