Difference A - B or B - A:

The difference A - B is the set of all of points that lie in A but not in B. It is illustrated in Figure illustrated the difference B - A.

           Figure: Difference A - B

These set-operations are utilized to combine the half-spaces to build up several objects. For instance, let us consider the cube make up from the intersection of the following six half-spaces.

- 4 < y and y < 4

- 4 < x and x < 4

- 1 < z and z < 1