Interval Notation

An interval is the set of all real numbers between two real numbers. Intervals are used in binning, in histograms, and in displays of data sources.

The standard mathematical notation for intervals indicates if the bounding numbers are in the interval: a square bracket next to a bounding number indicates that the number is in the interval; a parenthesis next to a number indicates that the number is not in the interval. The following examples illustrate the notation: