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Proof step 11 from proof sgn-append-02 (previous step)

bits0 ≠ [] ∧ (bits0.first ↔ boolvar), true ∈ bits0 → (∀ bits1. sgn(bits0 + false ' + bits1) = sgn(bits0) + false ' + bits1) ⊦ sgn((boolvar ' + bits0) + false ' + bits1) = sgn(bits0) + false ' + bits1, ¬ true ∈ bits0 ∧ ¬ boolvar

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 12:
true ∈ bits0 → (∀ bits1. sgn(bits0 + false ' + bits1) = sgn(bits0) + false ' + bits1) ⊦ sgn((bits0.first ' + bits0) + false ' + bits1) = sgn(bits0) + false ' + bits1, bits0 = [], ¬ true ∈ bits0 ∧ ¬ bits0.first

Rule argument

Additional information

Used simplifier rules: sgn-zero: ⊦ ¬ true ∈ bits ∧ bits ≠ [] → sgn(bits) = false ';