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Proof step 14 from proof fillsgn-butlast (previous step)

bytes2int(bytes.butlast) < 0, 0 ≤ bytes2int(bytes), # bytes ≤ n ⊦ fillsgn(n, bytes.butlast) = mklist(i2b(0), (n - # bytes) + 1) + bytes.butlast, bytes = [], # bytes = 1

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 15:
⊦ 0 ≤ bytes2int(bytes) ↔ bytes = [] ∨ 0 ≤ b2i(bytes.first)
Proof step 16:
bytes2int(bytes.butlast) < 0, bytes = [] ∨ 0 ≤ b2i(bytes.first), # bytes ≤ n ⊦ fillsgn(n, bytes.butlast) = mklist(i2b(0), (n - # bytes) + 1) + bytes.butlast, bytes = [], # bytes = 1

Rule argument

name: bytes2int-pos rotate: F subst: [bytes] → [bytes]

Additional information

Used terms: bytes