Set-builder & Interval Notation A set is a collection of unique elements. Elements in a set do not "repeat". Methods of Describing Sets: Sets may be described in many ways: by roster, by set-builder notation, by interval notation, by graphing on a number line, and/or by Venn diagrams. For graphing on a number line, see Linear Inequalities. For Venn diagrams, see Working … [Read more...] about Set-builder & Interval Notation