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theorem proved term proof

phiLadder_pos

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formal statement (Lean)

 153theorem phiLadder_pos (n : ℤ) : 0 < PhiLadder n :=

proof body

Term-mode proof.

 154  zpow_pos Constants.phi_pos n
 155
 156/-- The vacuum is at n = 0: J(φ⁰) = J(1) = 0. -/

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