| 8 = # fillsgn(8, int2bits(i)), # int2bits(i) < 8 ⊦ 8 ≤ # int2bits(j), lastn(8, fillsgn(8, bitsand(int2bits(i), int2bits(j)))) = lastn(8, fillsgn(8, bitsand(fillsgn(8, int2bits(i)), int2bits(j)))), bitsand(fillsgn(8, int2bits(i)), int2bits(j)) = [] |
8 = # fillsgn(8, int2bits(i)), # int2bits(j) < 8, # int2bits(i) < 8 ⊦ bitsand(fillsgn(8, int2bits(i)), int2bits(j)) = [], lastn(8, fillsgn(8, bitsand(int2bits(i), int2bits(j)))) = lastn(8, fillsgn(8, bitsand(fillsgn(8, int2bits(i)), int2bits(j))))
Used simplifier rules: ⊦ m < n ∧ n = n0 → m < n0; (forward)% ⊦ ¬ m ≤ n ↔ n < m;