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Proof step 1 from proof inni-ls (conclusion)

⊦ i→n(i) < n → ¬ n→i(n) ≤ i

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
n→i(n) ≤ i, i→n(i) < n ⊦ n = 0

Rule argument

Additional information

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