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Proof step 2 from proof bytes2int-len-one-01 (previous step)

bytes2int(bytes) < 128, 0 ≤ bytes2int(bytes) ⊦ bytes.first = i2b(0), bytes = [], # bytes = 1

User applied rule cut formula

And obtained the following new goals

Proof step 3:
bytes = bytes.butlast + bytes.last, bytes2int(bytes) < 128, 0 ≤ bytes2int(bytes) ⊦ bytes.first = i2b(0), bytes = [], # bytes = 1

Rule argument

fma: bytes = bytes.butlast + bytes.last

Additional information

Used simplifier rules: ⊦ bytes + by = bytes + by ';%bytes ≠ [] ⊦ bytes.butlast + bytes.last ' = bytes;% ⊦ (bytes + bytes0) + bytes1 = bytes + bytes0 + bytes1; Used formulas: bytes = bytes.butlast + bytes.last