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def definition def or abbrev

fibonacci_recurrence

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formal statement (Lean)

  63def fibonacci_recurrence (K : ℕ → ℝ) : Prop :=

proof body

Definition body.

  64  ∀ ℓ : ℕ, K (ℓ + 2) = K (ℓ + 1) + K ℓ
  65
  66/-- The constant-ratio property: K_{ℓ+1}/K_ℓ = r for all ℓ. -/

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