0 < i, 0 < i ^ j ⊦ i = 1, 0 ≤ j
Used simplifier rules: ⊦ 1 ≤ i ↔ 0 < i; (s)%numlsf-02: ⊦ (* i) < j → i + 1 ≤ j; (forward) from specification int-abs