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Proof step 6 from proof intshiftrsign-band31 (
previous step
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⊦ i i>> j = (# int2bits(i) ≤ i→n(band(j, 31)) ⊃ (i < 0 ⊃ ~1;0);bits2int(sublist(0, # int2bits(i) - i→n(band(j, 31)), int2bits(i))))
Lemma
intshiftrsign-if