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Proof step 4 from proof int2bytes-rec-shift (previous step)

int2bytes(i) ≠ [], i < ~128 ∨ 128 ≤ i ⊦ int2bytes(i >> 8) = int2bytes(i).butlast ∧ i2b(i) = int2bytes(i).last

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
i < ~128 ∨ 128 ≤ i ⊦ int2bytes(i >> 8) = int2bytes(i).butlast

Rule argument

Additional information

Used simplifier rules: int2bytes-empty: ⊦ int2bytes(i) ≠ [];%int2bytes-last-01: ⊦ int2bytes(i).last = i2b(i);