Purely imaginary number, Mathematics

It is totally possible that a or b could be zero and thus in 16i the real part is zero.  While the real part is zero we frequently will call the complex numbers a purely imaginary number.

 In the last example (113) the imaginary part is zero and actually we have a real number.  Thus, thinking of numbers in this light we can see that the real numbers are simply a subset of the complex numbers.

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