Overview
A complex number (複素数, fukusosū) is a different number from common numbers in many ways.
Just as the range of even and odd numbers together corresponds to the range of integers, the real and imaginary numbers together are complex numbers.
Any complex number can be expressed in the form "a+bi" (i is the root of -1, a and b are arbitrary real numbers).
If b=0, the number is real, otherwise it is imaginary.
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虚数とは (キョスウとは) [単語記事] - ニコニコ大百科 (NicoNico Encyclopedia)
