| i < 0 ⊦ gcd(abs(i), abs(i0 + i)) = gcd(i0 + i, i0), 0 < i ∧ i < i0 + i |
i < 0, i0 < 0 ⊦ gcd(abs(i), abs(i0 + i)) = gcd(i0 + i, i0), 0 < i ∧ i < i0 + i
i < 0 ⊦ gcd(abs(i), abs(i0 + i)) = gcd(i0 + i, i0), i0 < 0, 0 < i ∧ i < i0 + i
Used formulas: i0 < 0