j < 0 ⊦ b2i(i2b(i * 256 + j)) = b2i(i2b(j)), i = 0, ¬ i < 0 ∧ ¬ j < 0
⊦ j < 0, b2i(i2b(i * 256 + j)) = b2i(i2b(j)), i = 0, ¬ i < 0 ∧ ¬ j < 0
Used formulas: j < 0