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Proof step 12 from proof sgn-append-02 (previous step)

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

Heuristic elimination applied rule insert elim lemma

And obtained the following new goals

Rule argument

seq: bits ≠ [] ⊦ (boolvar ↔ bits.first) ∧ bits0 = bits.rest ↔ bits = boolvar + bits0 subst: [bits, boolvar, bits0] → [bits0, boolvar, bits] rotate: T spec: list-data inst: bitlista name: elim-list-c

Additional information

Used simplifier rules: bits ≠ [] ⊦ (boolvar ↔ bits.first) ∧ bits0 = bits.rest ↔ bits = boolvar + bits0; (elim) Used terms: bits0, boolvar, bits