# Interval Notation

Set can be described in three different forms if it contains numerical elements. That are Roaster form, Set builder form and Interval form. While the Roaster and Set Builder notations go with non numerical elements as well, Interval notation can be used only when we are dealing with set of real numbers. Roaster form which lists all the elements of a set is useful only when there a small number of discrete elements. Set Builder form describe the set using the properties of the elements.

Interval notation condenses the real numbers between the boundary values. Let us learn, how to express sets using interval notation and how the descriptions in other notations can be translated to interval notation.