4. Reciprocal of a Point, Division

If and MQ = U, one writes M = Q^--1 and this is called the reciprocal of Q. It is clear from the definition of multiplication that if with r not equal to zero, then

Figure 7

The division of a complex number P by a complex number Q which is not O can now be defined by Thus, if then See Figure 7.

For example, if and then