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Proof step 2 from proof shiftright-neg-mone (previous step)

0 ≤ 2 ^ (abs(j) - 1) + i, i < 0 ⊦ i >> j = ~1

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ i >> j = bits2int(sublist(0, # int2bits(i), mklist(int2bits(i).first, i→n(j)) + int2bits(i)))
Proof step 4:
0 ≤ 2 ^ (abs(j) - 1) + i, i < 0 ⊦ bits2int(sublist(0, # int2bits(i), mklist(int2bits(i).first, i→n(j)) + int2bits(i))) = ~1

Rule argument

name: shiftrsign-01 rotate: F subst: [j, i] → [j, i]

Additional information

Used terms: j, i