j0 < j, i0 < i, 0 ≤ j0, 0 < j, j * i < j * i0 + j0 ⊦ j * i = j * i0 + j0
Used simplifier rules: lels-02: ⊦ i ≠ j → (i ≤ j ↔ i < j); from specification int-abs