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Proof step 958 from proof bitsand-cast (previous step)

¬ true ∈ bits1 ∧ bits1 ≠ [] ⊦ bits2 + bits1 = [], bits0 = [], lastn(# bits1, fillsgn(# bits1, bitsand(false ', bits0))) = lastn(# bits1, fillsgn(# bits1, bitsand(bits2 + bits1, bits0))), true ∈ bits1

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 959:
⊦ bits1 = [], bits2 + bits1 = [], bits0 = [], lastn(# bits1, fillsgn(# bits1, false ')) = lastn(# bits1, fillsgn(# bits1, bitsand(bits2 + bits1, bits0))), true ∈ bits1

Rule argument

Additional information

Used simplifier rules: and-zero-02: ⊦ bits ≠ [] → bitsand(false ', bits) = false ';