# int2bits(j) + 1 < # int2bits(~ j) ⊦ 2 ^ i + j ≠ 0 ∧ ¬ 0 ≤ j
Used simplifier rules: ⊦ ¬ i < j ↔ j ≤ i;% ⊦ ~ i = j ↔ i + j = 0;