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Proof step 4 from proof n2s-zero (previous step)

¬ 10 ≤ n, n→s(n) = "0" ⊦ n = 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
n→s(n) = "0", n < 10 ⊦ n = 0

Rule argument

Additional information

Used simplifier rules: f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic1%lels-01: ⊦ ¬ m ≤ n ↔ n < m; from specification nat