i + i ^ i0 = 0, i ^ i0 = ~ i, abs(i ^ i0) = 1, 0 < i0 ⊦ i = ~1, i = 0, i0 = 0
Used simplifier rules: ⊦ ~ i = j ↔ i + j = 0; (s) Used formulas: i ^ i0 = ~ i