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Proof step 11 from proof inv-inverts-last (previous step)

leninv(nσ) = ∞, # nσ = ⌜n⌝ + ⌜1⌝ , (∀ n0. ∃ n1. n0 < n1 ∧ ¬ n < n1 ∧ nσ[n1] = nσ[n]) ∨ (∀ n0. ¬(¬ n < n0 ∧ nσ[n0] = nσ[n])), stutf(nσ) ⊦ ∞.n = n

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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