i0 % j = 0, 0 < j, 0 ≤ i0, 0 ≤ i ⊦ (i + i0) % j = i % j
Used simplifier rules: mod-less-01: ⊦ 0 < j → i % j < j;%lf-03: ⊦ i < j ∧ i = i0 → i0 < j; (forward) from specification int-basic1