i < 0 ⊦ i / j = 0 ↔ abs(i) < abs(j), 0 = j, 0 < i ∧ 0 < j
⊦ i / j = 0 ↔ abs(i) < abs(j), 0 = j, i < 0, 0 < i ∧ 0 < j
Used formulas: i < 0