gcd(i, i0) ≠ 0, abs(i0) ≠ 0, 0 ≤ gcd(i, i0), abs(i0) / gcd(i, i0) = 0 ⊦ i = 0, i0 = 0
Used simplifier rules: ⊦ gcd(i, j) = 0 ↔ i = 0 ∧ j = 0; Used formulas: gcd(i, i0) ≠ 0