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Theorem eq-leninv

⊦ ⌜n⌝ < # nσ ∧ stutf(nσ) → (⌜nσ[n]⌝ = leninv(nσ) ↔ # nσ = ∞ ∧ (∀ m. n < m ∧ ⌜m⌝ < # nσ → nσ[m] = nσ[n]))

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