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Proof step 10 from proof rightshift-8-02 (previous step)

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

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 11:
⊦ bytes ≠ [] → (by ' + bytes).butlast = by ' + bytes.butlast
Proof step 12:
int2bytes(i) ≠ [], # int2bytes(i) = 1, 0 ≤ i ⊦ i >> 8 = bytes2int(i2b(0) ' + int2bytes(i).butlast)

Rule argument

seq: ⊦ bytes ≠ [] → (by ' + bytes).butlast = by ' + bytes.butlast subst: [bytes, by] → [int2bytes(i), i2b(0)] rotate: F spec: list-last inst: bytelist name: bc

Additional information

Used simplifier rules: int2bytes-empty: ⊦ int2bytes(i) ≠ []; Used terms: int2bytes(i), i2b(0)