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def definition def or abbrev

jcost_deriv

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formal statement (Lean)

  83noncomputable def jcost_deriv (x : ℝ) : ℝ := (1 - (x⁻¹)^2) / 2

proof body

Definition body.

  84
  85/-- **THEOREM IC-005.6**: J'(1) = 0 — the gradient vanishes at the ground state.
  86    This confirms x = 1 is the unique critical point (and global minimum). -/

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