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Proof step 1 from proof lsleninv-1 (conclusion)

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

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information