b 
0 > a & 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 < 0
i,j:. i > j -i < -j)
3| 1 | 3. 0 > ab 0 > a & b > 0 a > 0 & b < 0 ab < 0 a < 0 & b > 0 a > 0 & b < 0 |
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