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Proof step 27 from proof int2bytes-rec255-neg (previous step)

i < 0, i < ~128, 2 < # int2bytes(i % 256) ⊦ lastn(2, int2bytes(i % 256)).rest = int2bytes(i % 256).last ', 2 = # int2bytes(i % 256)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 28:
⊦ ~256 ≤ i ∧ i < ~128 → # int2bytes(i) = 2
Proof step 29:
¬(~256 ≤ i % 256 ∧ i % 256 < ~128), i < 0, i < ~128, 2 < # int2bytes(i % 256) ⊦ lastn(2, int2bytes(i % 256)).rest = int2bytes(i % 256).last ', 2 = # int2bytes(i % 256)

Rule argument

name: int2bytes-len-neg256 rotate: F subst: [i] → [i % 256]

Additional information

Used terms: i % 256