⊦ 0 ≤ i ∧ 0 ≤ j → i2b(i + j) = i2b(b2i(i2b(i)) + j)
¬(0 ≤ i ∧ 0 ≤ j) ⊦ i2b(i + j) = i2b(b2i(i2b(i)) + j)
Used terms: j, i