Subtraction
Subtracting Intervals is much like adding Intervals. To subtract Intervals simply subtract the lowest X value by the highest Y value, then subtract the highest X value by the lowest Y value.
| 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. When subtracting you are subtracting a-d and b-c.
| X Values:
|
| [a,b]
|
| Y Values:
| -
| [c,d]
|
| Result:
|
| [e,f]
|