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Proof step 7 from proof bytes2bytes-identity (previous step)

1 + # bytes0 = # int2bytes(bytes2int(by ' + bytes0)) ⊦ int2bytes(bytes2int(by ' + bytes0)) = by ' + bytes0, b2i(by) ≠ ~1 ∧ b2i(by) ≠ 0

User applied rule case distinction

And obtained the following new goals

Proof step 8:
1 + # bytes0 = # int2bytes(bytes2int(by ' + bytes0)) ⊦ b2i(by) ≠ ~1, int2bytes(bytes2int(by ' + bytes0)) = by ' + bytes0
Proof step 21:
1 + # bytes0 = # int2bytes(bytes2int(by ' + bytes0)) ⊦ b2i(by) ≠ 0, int2bytes(bytes2int(by ' + bytes0)) = by ' + bytes0

Rule argument

pos: right 2

Additional information