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Proof step 3 from proof lsleninv-2 (previous step)

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

Lemma lsleninv-1