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Proof step 1 from proof not-ls-leninv (conclusion)

⊦ ⌜n⌝ < # nσ ∧ stutf(nσ) → (¬ ⌜nσ[n]⌝ < leninv(nσ) ↔ ⌜nσ[n]⌝ = leninv(nσ))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information