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Made more precise.
An '''imaginary number''' in mathematics is any number that contains the imaginary unit, defined as, <math>i^{2} = -1</math>
An '''imaginary number''' in mathematics is any number that is a multiple the imaginary unit, defined as, <math>i^{2} = -1</math>
An imaginary number is of the form, <math>k i</math>, where ''k'' is a [[real number]].
An imaginary number is of the form, <math>k i</math>, where ''k'' is a [[real number]].