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theorem proved term proof

J_nonneg

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formal statement (Lean)

  75theorem J_nonneg (x : ℝ) (hx : 0 < x) : 0 ≤ J x :=

proof body

Term-mode proof.

  76  Jcost_nonneg hx
  77
  78/-- **Defect characterization**: J(x) = (x − 1)²/(2x) for x ≠ 0. -/

depends on (7)

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