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Proof step 1 from proof inv-get-inverse-between (conclusion)

⊦ stutf(nσ) ∧ ⌜n⌝ + ⌜1⌝ < leninv(nσ) ∧ inv(nσ)[n] + m + 1 < inv(nσ)[n + 1] → nσ[inv(nσ)[n] + m + 1] = n + 1

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information