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Proof step 19 from proof leq-leninv (previous step)

# nσ ≠ ∞, nσ[(# nσ).n - 1] = n1, ⌜n⌝ < # nσ, stutf(nσ), n1 + 1 < nσ[n] ⊦ nσ[n] = 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information