0 < j, i0 ≤ i, 0 ≤ i, 0 ≤ i0 ⊦ (∃ i1. i = j * i1 + i0) ↔ i % j = i0 % j
Used simplifier rules: ⊦ i - j = i0 ↔ i = i0 + j; (s)