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Proof step 18 from proof inv-get-inverse-last (previous step)

⊦ stutf(nσ) → (max∞(λ n. ⌜n⌝ < # nσ ∧ nσ[n] = m) = ∞ ↔ # nσ = ∞ ∧ (∃ n. ∀ n0. ¬ n0 < n → nσ[n0] = m) ∨ (∀ n. ⌜n⌝ < # nσ → nσ[n] < m))

Lemma stutf-maxinf-is-fin