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Proof step 8 from proof modeven-neg (previous step)

1 + i0 * 2 = i1 * 2 + j0, abs(j0) < 2, i0 < 0, j0 ≤ 0 ⊦ j0 = ~1

User applied rule cut formula

And obtained the following new goals

Proof step 9:
1 + i0 * 2 = i1 * 2 + j0, abs(j0) < 2, i0 < 0, j0 ≤ 0 ⊦ j0 = ~1, j0 = ~1

Rule argument

fma: j0 = ~1

Additional information

Used formulas: j0 = ~1