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Math Terms and Definitions from A to Z

Irrational Numbers

The set of irrational numbers contains all the numbers that cannot be expressed as a ratio of two integers. Sometimes, it is defined as all the real numbers “minus” the set of rational numbers.

The symbol for the set of irrational numbers is

R\Q or R backslash Q

The backslash ( \ ) means “minus”. In fact, others would informally write the set of irrational numbers as R - Q.

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