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Proof step 912 from proof bitsand-cast (previous step)

bits2 = [], mklist(true, # bits1) = bits1, # bits = # bits1 ⊦ bits = lastn(# bits1, fillsgn(# bits1, bitsand(bits2 + bits1, bits3 + bits))), bits3 + bits = [], bits2 + bits1 = [], bits1 = [], bits2 ≠ [] ∧ bits3 ≠ []

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 913:
mklist(true, # bits1) = bits1, # bits = # bits1 ⊦ bits = lastn(# bits1, fillsgn(# bits1, bitsand(bits1, bits3 + bits))), bits3 + bits = [], bits1 = []

Rule argument

Additional information

Used simplifier rules: ⊦ (bits + bits0) + bits1 = bits + bits0 + bits1;% ⊦ [] + bits = bits;