m < # int2bits(i), i < ~1, i < 0 ⊦ ¬ # int2bits(i) ≤ i→n(n→i(m) - 1) + 1, m = 0
¬ # int2bits(i) ≤ i→n(n→i(m) - 1) + 1, i < ~1, i < 0 ⊦ m < # int2bits(i), m = 0