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Proof step 14 from proof sgn-lastn-01 (previous step)

n ≤ # sgn(boolvar ' + bits), ∀ n0. ¬ # sgn(boolvar ' + bits) < n0 → lastn(n0, sgn(boolvar ' + bits)) = lastn(n0, boolvar ' + bits) ⊦ lastn(n, sgn(boolvar ' + bits)) = lastn(n, boolvar ' + boolvar ' + bits)

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

seq: ⊦ n < # bits → lastn(n, bits) = lastn(n, bits.rest) subst: [bits, n] → [boolvar ' + boolvar ' + bits, n] rotate: F spec: list-del inst: bitlista name: lastN-rec-02

Additional information

Used terms: boolvar ' + boolvar ' + bits, n