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Proof step 3 from proof bytes2int-len-one-01 (previous step)

bytes = bytes.butlast + bytes.last, bytes2int(bytes) < 128, 0 ≤ bytes2int(bytes) ⊦ bytes.first = i2b(0), bytes = [], # bytes = 1

User applied rule insert elim lemma

And obtained the following new goals

Proof step 4:
bytes = bytes0 + by ', bytes = bytes0 + by, bytes2int(bytes) < 128, 0 ≤ bytes2int(bytes) ⊦ bytes.first = i2b(0), bytes = [], # bytes = 1

Rule argument

seq: bytes ≠ [] ⊦ by = bytes.last ∧ bytes0 = bytes.butlast ↔ bytes = bytes0 + by ' subst: [bytes, by, bytes0] → [bytes, by, bytes0] rotate: T spec: list-last inst: bytelist name: last-elim

Additional information

Used simplifier rules: bytes ≠ [] ⊦ by = bytes.last ∧ bytes0 = bytes.butlast ↔ bytes = bytes0 + by '; (elim) Used terms: bytes, by, bytes0