imaginary number
The complex number introduced to make it possible to solve equations without any real solution, such as x2 + 1 = 0.

A complex number takes the form z = x + yi, in which x and y are real numbers and i is called the imaginary unit with the property of i2 = -1. This imaginary unit can be considered to be the square root of minus one. x is the real part and yi is the imaginary part.

Related Term: real number

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