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Proof step 6 from proof band-011x-is-unsigned-03 (
previous step
)
⊦ ¬ false ∈ int2bits(i0).rest ∧ abs(j) ≤ 2 ^ n→i(# int2bits(i0) - 2) ∧ 0 < i0 → band(j, i0) = bits2uint(fillsgn(# int2bits(i0) - 1, int2bits(j)))
Lemma
band-011x-is-unsigned-01