⊦ i→n(i) ≤ i→n(j) ↔ abs(i) ≤ abs(j)
Used simplifier rules: ⊦ 0 < j → abs(j) = j; (s)% ⊦ 0 ≤ i → abs(i) = i; (s)% ⊦ i < j → (j ≤ i ↔ false); (as) Used terms: j0, j