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def definition def or abbrev

cfracLevelCost

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formal statement (Lean)

 206def cfracLevelCost (partialQuotient : ℕ) : ℝ :=

proof body

Definition body.

 207  Jcost (partialQuotient + 1 / phi)
 208
 209/-- The partial quotient 1 (giving ratio φ) has the minimum J-cost
 210    among all positive integer partial quotients.
 211
 212    This is because J is increasing on [1,∞) and 1 + 1/φ = φ ≈ 1.618
 213    is less than 2 + 1/anything. -/

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