**Interval Notation**

A notation for representing an interval as a pair of numbers. The numbers are the endpoints of the interval. Parentheses and/or brackets are used to show whether the endpoints are excluded or included. For example, [3, 8) is the interval of real numbers between 3 and 8, including 3 and excluding 8.

Note: Many authors use reversed brackets instead of parentheses. For example, ]5,7[ refers to the interval from 5 to 7, exclusive. The interval in the example below would be written [–1, 2[.

**See also**

Open interval, closed interval, half-open interval, half-closed interval, inclusive, exclusive

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