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theorem proved term proof

Jcost_phiLadder_zero

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formal statement (Lean)

 157theorem Jcost_phiLadder_zero : Jcost (PhiLadder 0) = 0 := by

proof body

Term-mode proof.

 158  simp [PhiLadder, Jcost_unit0]
 159
 160/-- **φ-ladder reciprocal symmetry**: J(φⁿ) = J(φ⁻ⁿ). -/

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depends on (6)

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