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Proof step 2 from proof sgn-zero (previous step)

⊦ bits = [], sgn(bits) = false ', true ∈ bits

User applied rule structural induction

And obtained the following new goals

Proof step 3:
bits0 = [] ∨ sgn(bits0) = false ' ∨ true ∈ bits0 ⊦ boolvar + bits0 = [] ∨ sgn(boolvar + bits0) = false ' ∨ true ∈ boolvar + bits0

Rule argument

indvar: bits

Additional information

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