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imaginary number

No more false than that of a mathematical cryptographer who believes in the imaginary number ’i’ because it helps her break codes.

Dan Brown -- The Da Vinci Code

a complex number in which the multiple of i (the square root of -1) is not zero

(a complex number is any number that can be expressed in terms of i (the square root of -1); e.g., a + bi where a and b are real numbers. In an imaginary number, b is not zero.)