m < n, ⌜n⌝ < # nσ, mon<(nσ), nσ[n] ≤ nσ[m] ⊦
Used simplifier rules: ⊦ m < n → n ≠ 0; (s)%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic% ⊦ m < n ↔ ¬ n ≤ m; (ss)