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Proof step 1 from proof inv-ls-succ (conclusion)

⊦ stutf(nσ) ∧ ⌜n⌝ + ⌜1⌝ < leninv(nσ) → inv(nσ)[n] < inv(nσ)[n + 1]

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
stutf(nσ), ⌜n⌝ + ⌜1⌝ < leninv(nσ), inv(nσ)[n + 1] ≤ inv(nσ)[n] ⊦

Rule argument

Additional information

Used simplifier rules: lels: ⊦ ¬ m < n ↔ n ≤ m; from specification nat