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Real and Imaginary Numbers

In one sense all numbers are “real.” After all, I’m real and I’m thinking about them … so they’re certainly real to me. But as we’ve discussed before, only some numbers are really real. And that’s because the word “real” has a particular meaning in math. Real numbers are all the numbers you can find on a real number line. That means that real numbers include zero and the other integers, all the rest of the rational numbers, and each and every one of the infinity of irrational numbers, too.

Imaginary numbers can be used to solve problems that real numbers can’t deal with.

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