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Proof step 7 from proof fix-rec-neg (previous step)

0 ≤ bytes2int(by ' + bytes0), b2i(by) < 0, 1 + # bytes0 < n ⊦ fix(n, by ' + bytes0) = i2b(~1) ' + fix(n - 1, by ' + bytes0)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 8:
⊦ 0 ≤ bytes2int(by ' + bytes) ↔ 0 ≤ b2i(by)

Rule argument

name: bytes2int-ge-zero rotate: F subst: [bytes, by] → [bytes0, by]

Additional information

Used simplifier rules: ⊦ i < j → (¬ ¬ j ≤ i ↔ false); Used terms: bytes0, by