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Imaginary Number

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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.

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