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Proof step 27 from proof bytes2int-int2bytes-len-eq (previous step)

# bytes1 + 1 = # int2bytes(bytes2int(bytes1) * 256 + band(b2i(by), 255)), bytes2int(bytes1) * 256 + band(b2i(by), 255) < 0, bytes2int(bytes1) * 256 + band(b2i(by), 255) < ~256, ∀ bytes0. # bytes0 < #(bytes1 + by ') → true → # bytes0 = # int2bytes(bytes2int(bytes0)) → bytes0 = int2bytes(bytes2int(bytes0)) ⊦ bytes1 + by ' = int2bytes(bytes2int(bytes1) * 256 + band(b2i(by), 255)), bytes1 = [], bytes2int(bytes1) * 256 + band(b2i(by), 255) = ~256

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 28:
⊦ i < ~256 ∧ i % 256 = 0 → int2bytes(i) = int2bytes(i / 256) + int2bytes(i % 256).last '
Proof step 29:
¬(bytes2int(bytes1) * 256 + band(b2i(by), 255) < ~256 ∧ (bytes2int(bytes1) * 256 + band(b2i(by), 255)) % 256 = 0), # bytes1 + 1 = # int2bytes(bytes2int(bytes1) * 256 + band(b2i(by), 255)), bytes2int(bytes1) * 256 + band(b2i(by), 255) < 0, bytes2int(bytes1) * 256 + band(b2i(by), 255) < ~256, ∀ bytes0. # bytes0 < #(bytes1 + by ') → true → # bytes0 = # int2bytes(bytes2int(bytes0)) → bytes0 = int2bytes(bytes2int(bytes0)) ⊦ bytes1 + by ' = int2bytes(bytes2int(bytes1) * 256 + band(b2i(by), 255)), bytes1 = [], bytes2int(bytes1) * 256 + band(b2i(by), 255) = ~256
Proof step 72:
bytes2int(bytes1) * 256 + band(b2i(by), 255) < ~256 ∧ (bytes2int(bytes1) * 256 + band(b2i(by), 255)) % 256 = 0, # bytes1 + 1 = #(int2bytes((bytes2int(bytes1) * 256 + band(b2i(by), 255)) / 256) + int2bytes((bytes2int(bytes1) * 256 + band(b2i(by), 255)) % 256).last '), bytes2int(bytes1) * 256 + band(b2i(by), 255) < 0, bytes2int(bytes1) * 256 + band(b2i(by), 255) < ~256, ∀ bytes0. # bytes0 < #(bytes1 + by ') → true → # bytes0 = # int2bytes(bytes2int(bytes0)) → bytes0 = int2bytes(bytes2int(bytes0)) ⊦ bytes1 + by ' = int2bytes((bytes2int(bytes1) * 256 + band(b2i(by), 255)) / 256) + int2bytes((bytes2int(bytes1) * 256 + band(b2i(by), 255)) % 256).last ', bytes1 = [], bytes2int(bytes1) * 256 + band(b2i(by), 255) = ~256

Rule argument

name: int2bytes-rec-neg-256 rotate: F subst: [i] → [bytes2int(bytes1) * 256 + band(b2i(by), 255)]

Additional information

Used terms: bytes2int(bytes1) * 256 + band(b2i(by), 255)