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Proof step 1 from proof lsleninv-1 (conclusion)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
n < nσ[m], ⌜m⌝ < # nσ, stutf(nσ) ⊦ ⌜n⌝ < leninv(nσ)

Rule argument

Additional information

Used simplifier rules: f: ⊦ m < n → n ≠ 0; from specification nat-basic1%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic1