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Proof step 17 from proof bytes2bytes-identity (previous step)

2 + # bytes = # int2bytes(bytes2int(i2b(~1) ' + by0 ' + bytes)), b2i(by0) < 0 ⊦ int2bytes(bytes2int(i2b(~1) ' + by0 ' + bytes)) = i2b(~1) ' + by0 ' + bytes

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 18:
⊦ b2i(by) < 0 → bytes2int(i2b(~1) ' + by ' + bytes) = bytes2int(by ' + bytes)
Proof step 19:
b2i(by0) < 0, 2 + # bytes = # int2bytes(bytes2int(by0 ' + bytes)), b2i(by0) < 0 ⊦ int2bytes(bytes2int(by0 ' + bytes)) = i2b(~1) ' + by0 ' + bytes

Rule argument

name: bytes2int-mone rotate: F subst: [bytes, by] → [bytes, by0]

Additional information

Used terms: bytes, by0