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Proof step 8 from proof modex-odd-neg (previous step)

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

User applied rule cut formula

And obtained the following new goals

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

Rule argument

fma: j0 = ~1

Additional information

Used formulas: j0 = ~1