m < max(n, n0) ⊦ max(n, n0) = max(max(m, n), n0), max(n, n0) = 0
Used simplifier rules: Max-left: ⊦ m < n → max(m, n) = n;%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic1