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Proof step 4 from proof longshiftzero-not-neg-01 (previous step)

>>>(64, i, band(j, 63)) < 0, i < 0 ⊦ band(j, 63) = 0

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 5:
⊦ 0 ≤ i ∨ j ≠ 0 → ¬ >>>(n, i, j) < 0

Rule argument

name: shiftzero-not-neg rotate: F subst: [j, i, n] → [band(j, 63), i, 64]

Additional information

Used simplifier rules: band-commutativity: ⊦ band(i, j) = band(j, i); Used terms: band(j, 63), i, 64