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lemma proved term proof

prefer_refl

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formal statement (Lean)

  29lemma prefer_refl (M : CostModel A) (a : A) : Prefer M a a := by

proof body

Term-mode proof.

  30  dsimp [Prefer]
  31  exact le_rfl
  32
  33/-- Transitivity: if `a ≼ b` and `b ≼ c`, then `a ≼ c`. -/

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depends on (8)

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