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Proof step 7 from proof bitsand-cast-01 (previous step)

n ≠ # fillsgn(n, bits), # bits < n ⊦ lastn(n, fillsgn(n, bitsand(lastn(n, fillsgn(n, bits)), bits0))) = lastn(n, fillsgn(n, bitsand(bits, bits0))), bits0 = [], bits = []

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 8:
# bits < n ⊦ n = # fillsgn(n, bits), bits = [], bits0 = [], lastn(n, fillsgn(n, bitsand(lastn(n, fillsgn(n, bits)), bits0))) = lastn(n, fillsgn(n, bitsand(bits, bits0)))

Proof step 7 from proof bitsand-cast-01 (previous step)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information