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theorem proved term proof

jcost_deriv_zero_at_one

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formal statement (Lean)

  87theorem jcost_deriv_zero_at_one : jcost_deriv 1 = 0 := by

proof body

Term-mode proof.

  88  unfold jcost_deriv; simp
  89
  90/-- **THEOREM IC-005.7**: J'(x) > 0 for x > 1.
  91    The gradient points upward away from the minimum for x > 1. -/

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