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Proof step 4 from proof leninv-zero (previous step)

stutf(nσ) ⊦ max∞(λ n. n ≠ 0 → (∃ m. ⌜m⌝ < # nσ ∧ nσ[m] = n - 1 ∧ ¬(# nσ = ∞ ∧ (∀ m0. m < m0 → nσ[m0] = n - 1)))) = ⌜0⌝ ↔ nσ = ⌜λ n. 0⌝

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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