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Proof step 5 from proof byte-not-max (previous step)

b2i(by) + i = 127, 126 < b2i(by), 0 < b2i(by), 0 < i ⊦

User applied rule cut formula

And obtained the following new goals

Proof step 6:
b2i(by) = 127 - i, b2i(by) + i = 127, 126 < b2i(by), 0 < b2i(by), 0 < i ⊦

Rule argument

fma: b2i(by) = 127 - i

Additional information

Used simplifier rules: ⊦ i - j = i0 ↔ i = i0 + j; Used formulas: b2i(by) = 127 - i