j0 * j + i = i1 + i0, j ≤ 0 ⊦ j | i1 ↔ ≡mod(i, i0, j)
Used simplifier rules: ⊦ i0 = i - j ↔ i = i0 + j; (elim) Used terms: j0 * j + i, i0, i1