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def definition def or abbrev

Prefer

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formal statement (Lean)

  21def Prefer (M : CostModel A) (a b : A) : Prop := M.cost a ≤ M.cost b

proof body

Definition body.

  22
  23infix:50 "≼" => Prefer
  24
  25/-- Net improvement predicate: `a` strictly improves on `b`. -/

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