imaginary number

Definitions

1. A number of the form bi, where b is any real number and i denotes the imaginary unit.
   strict-sense
2. A number of the form a + bi, where a and b are real numbers and b is nonzero.
   broadly

Equivalents

Examples

“If a#61;0, then x#61;ib is called an imaginary number⟳. The message here is that we must introduce⟳ imaginary numbers in order⟳ to be able to solve⟳ quadratic equations in general.”

CEFR level