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Proof step 1 from proof fits-law-sub (conclusion)

⊦ b2i(by1) - b2i(by2) = s2i(i2s(b2i(by1) - b2i(by2)))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ b2i(by1) = s2i(i2s(b2i(by1) - b2i(by2))) + b2i(by2)

Rule argument

Additional information

Used simplifier rules: ⊦ i - j = i0 ↔ i = i0 + j;