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Proof step 3 from proof notequal (previous step)

i2b(i) = i2b(j), ~128 ≤ i, i ≤ 127, ~128 ≤ j, j ≤ 127 ⊦ i = j

User applied rule cut formula

And obtained the following new goals

Proof step 4:
b2i(i2b(i)) = b2i(i2b(j)), i2b(i) = i2b(j), ~128 ≤ i, i ≤ 127, ~128 ≤ j, j ≤ 127 ⊦ i = j

Rule argument

fma: b2i(i2b(i)) = b2i(i2b(j))

Additional information

Used simplifier rules: byte-equal: ⊦ b2i(byi) = b2i(byj) ↔ byi = byj; Used formulas: b2i(i2b(i)) = b2i(i2b(j))