Web Reference: Learn how to use interval notation to represent subsets of real numbers. See examples of open, closed, half-open and compound intervals, and how to write them in set-builder notation. Learn how to represent subsets of real numbers using interval notation, which is a way of writing inequalities. See different types of intervals, how to graph them, and how to convert inequalities to interval notation. Interval notation is a way to represent a set of real numbers on the number line. It consists of two numbers separated by a comma, and the numbers are enclosed in either parentheses or square brackets.
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