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Proof step 13 from proof sgn-last-same (previous step)

false ∈ bits ⊦ sgn(bits + boolvar ') = boolvar ', (¬ boolvar) ∈ bits, ¬ boolvar ∧ ¬ true ∈ bits

User applied rule case distinction

And obtained the following new goals

Proof step 14:
false ∈ bits ⊦ ¬ true ∈ bits, sgn(bits + boolvar ') = boolvar ', (¬ boolvar) ∈ bits

Rule argument

pos: right 3

Additional information