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Proof step 2 from proof bitsinvert-size (previous step)

⊦ bits = [], # sgn(bitsinvert(bits)) = # sgn(bits)

User applied rule structural induction

And obtained the following new goals

Proof step 3:
bits0 = [] ∨ # sgn(bitsinvert(bits0)) = # sgn(bits0) ⊦ boolvar + bits0 = [], # sgn(bitsinvert(boolvar + bits0)) = # sgn(boolvar + bits0)

Rule argument

indvar: bits

Additional information

Used simplifier rules: bitlist freely generated by [], +;;