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Proof step 33 from proof rightshift-8-02 (previous step)

# int2bytes(i) = 1, i < 0, i < ~128 ⊦ i >> 8 = bytes2int(i2b(~1) ' + int2bytes(i).butlast)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 34:
⊦ # bytes = 1 ↔ bytes = bytes.first + []
Proof step 35:
int2bytes(i) = int2bytes(i).first + [], i < 0, i < ~128 ⊦ i >> 8 = bytes2int(i2b(~1) ' + int2bytes(i).butlast)

Rule argument

seq: ⊦ # bytes = 1 ↔ bytes = bytes.first + [] subst: [bytes] → [int2bytes(i)] rotate: F spec: list-data inst: bytelist name: lf-01

Additional information

Used terms: int2bytes(i)