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Proof step 21 from proof fits-law-shr (previous step)

0 ≤ band(i, 31), b2i(by) < ~1, b2i(by) < 0, 0 < band(i, 31), band(i, 31) < 32 ⊦ (b2i(by) + 1) / 2 ^ band(i, 31) = b2i(i2b((b2i(by) + 1) / 2 ^ band(i, 31) - 1)) + 1, ¬ (b2i(by) + 1) / 2 ^ band(i, 31) < ~127 ∧ ¬ 128 < (b2i(by) + 1) / 2 ^ band(i, 31)

User applied rule case distinction

And obtained the following new goals

Rule argument

pos: right 2

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