Imaginary Number
 |
|
In mathematics, an imaginary number is multiple of the imaginary unit i (the square root of -1).
Imaginary number is a high school-level concept that would be first encountered in a pre-calculus course covering complex numbers. It is listed in the California State Standards for Algebra II.
Examples
| i: | i is the symbol used to denote the principal square root of -1, also called the imaginary unit. |