Division
Dividing Intervals is a lot more complicated then adding and subtracting Intervals. To devide Intervals follow the steps below:
low X=a
high X=b
low Y=c
high Y=d
low result=e
high result=f
A) If c >= 0
1. If a >= 0
a) a / d = e
b) b / c = f
2. If b <= 0
a) a / c = e
b) b / d = f
3. If neither 1 or 2 apply
a) a / c = e 
b) b / c = e
B) If d <= 0
1. If a >= 0
a) b / d = e
b) a / c = f
2. If b <= 0
a) b / c = e
b) a / d = f
3. If neither 1 of 2 apply
a) b / d = e
b) a / d = f
C) If c <= 0 and d >= 0
1. If c >= 0
a) e = -INFINITY
b) f = +INFINITY
| X Values:
| [a,b]
|
| Y Values:
| [c,d]
|
When calculating Intervals the X values are placed "on top of" the Y values. Also the lowest value of either the X of the Y is placed first in the set.
| X Values:
|
| [a,b]
|
| Y Values:
| /
| [c,d]
|
| Result:
|
| [e,f]
|