8i: The Imaginary Number

Possibly the most interesting strange number is the sadly maligned i, the square root of –1, also known as the “imaginary” number. Where’d this strange thing come from? Is it real (not in the sense of real numbers, but in the sense of representing something real and meaningful in our world)? What’s it good for?

Get Good Math now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.