b > -0 
-a > -0 & b > 0 
-a < -0 & b < 0
ab < 0 a < 0 & b > 0 a > 0 & b < 0
b > 0 -a > 0 & b > 0 -a < 0 & b < 0 ab < 0 a < 0 & b > 0 a > 0 & b < 0b > -0 -a > -0 & b > 0 -a < -0 & b < 0) 3| 1 | 3. -ab > -0 -a > -0 & b > 0 -a < -0 & b < 0 ab < 0 a < 0 & b > 0 a > 0 & b < 0 |
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