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Proof step 942 from proof bitsand-cast (previous step)

# bits ≤ # bits1 ∧ bits ≠ [] ∧ ¬ bits.first, # bits = # bits1, mklist(true, # bits1) = bits1 ⊦ bits2 = [], bits1 = [], bits2 + bits1 = [], bits = [], bits = lastn(# bits1, fillsgn(# bits1, bitsand(bits1, bits)))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 943:
mklist(true, # bits1) = bits1, # bits = # bits1 ⊦ bits = [], bits = lastn(# bits1, fillsgn(# bits1, bitsand(bits1, bits))), bits2 + bits1 = [], bits1 = [], bits2 = [], bits.first

Rule argument

Additional information

Used simplifier rules: ⊦ m ≤ m;