0 < i ⊦ 2 ^ (i - 1) ≤ j + 2 ^ i ↔ 0 ≤ j + 2 ^ (i - 1)
Used simplifier rules: forward-le-05: ⊦ i < j ∧ 0 ≤ i → 0 < j; (forward) from specification int-abs