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Proof step 939 from proof bitsand-cast (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 940:
# bits = # bits1, bits.first ⊦ bits1 = [], bits2 = [], bits2 + bits1 = [], bits = [], bits = lastn(# bits1, fillsgn(# bits1, bits2 + bits)), false ∈ bits1

Rule argument

Additional information

Used simplifier rules: ⊦ m ≤ m;% ⊦ ¬ false ∈ bits → mklist(true, # bits) = bits;