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Proof step 28 from proof fillsgn-short (previous step)

fillsgn(2, by ') = by ', 1 ≤ # fillsgn(1, by ') ⊦ fillsgn(1, by ') = []

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 29:
⊦ # bytes < n ∧ bytes2int(bytes) < 0 → fillsgn(n, bytes) = mklist(i2b(~1), n - # bytes) + bytes
Proof step 30:
¬(# by ' < 2 ∧ bytes2int(by ') < 0), fillsgn(2, by ') = by ', 1 ≤ # fillsgn(1, by ') ⊦ fillsgn(1, by ') = []

Rule argument

name: fillsgn-neg rotate: F subst: [bytes, n] → [by ', 2]

Additional information

Used simplifier rules: ⊦ # by ' = 0 +1;% ⊦ mklist(by, 1) = by ';% ⊦ by ' = by0 ' + bytes ↔ by = by0 ∧ bytes = [];% ⊦ by ' ≠ [];% ⊦ (bytes + bytes0) + bytes1 = bytes + bytes0 + bytes1; Used terms: by ', 2