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structure definition def or abbrev

CostModel

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formal statement (Lean)

  14structure CostModel (A : Type u) where
  15  cost : A → ℝ
  16  nonneg : ∀ a, 0 ≤ cost a
  17
  18variable {A : Type u}
  19
  20/-- Ethical preference: `a ≼ b` iff `cost a ≤ cost b` (lower cost is better). -/

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