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Proof step 4 from proof bits2int-lasteq (previous step)

¬(boolvar ∧ ¬ bits.first ∧ bits ≠ []) ⊦ bits = [], bits0 = [], bits2int(bits + boolvar ') = bits2int(bits0 + boolvar ') ↔ bits2int(bits) = bits2int(bits0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
⊦ bits = [], bits0 = [], bits2int(bits + boolvar ') = bits2int(bits0 + boolvar ') ↔ bits2int(bits) = bits2int(bits0), boolvar ∧ ¬ bits.first

Proof step 4 from proof bits2int-lasteq (previous step)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information