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Theorem inv-inverts-leq

⊦ stutf(nσ) ∧ ⌜n⌝ < # nσ ∧ ⌜nσ[n]⌝ < leninv(nσ) → (¬ ¬ inv(nσ)[nσ[n]] < n ↔ false)

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Infos about the proof