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Proof step 5 from proof bits2int8-02 (previous step)

bits2int(lastn(8, bits)) < ~128, 8 < # bits, bits2int(lastn(8, bits)) < 0 ⊦ # lastn(8, bits) = 8, bits = []

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 6:
⊦ n ≤ # bits → # lastn(n, bits) = n

Rule argument

seq: ⊦ n ≤ # bits → # lastn(n, bits) = n subst: [bits, n] → [bits, 8] rotate: F spec: list-del inst: bitlista name: lastN-length

Additional information

Used simplifier rules: ⊦ ¬ m ≤ n ↔ n < m;% ⊦ m < n → ¬ n < m; Used terms: bits, 8