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Lesson 90: Sets Part 1 Objectives: 1. Students use set notation to indicate sets of numbers. 2. Students find the unions and intersections of sets. 3. Students determine whether a set is a subset of another set. 4. Students draw Venn diagrams to illustrate relationships among sets. Definitions: 1. set: is a collection of elements a. elements: Example: The set of whole numbers can be represented as: Notice the notation, list the elements of a set in braces {} Why do we have ellipsis at the end, but not at the beginning? Example: Use set notation to denote the set of integers. Example: Use set notation to denote the set of even integers. New Symbols: : indicates an element is in the set : indicates an element is not an element of the set Example: Use set notation to indicate whether each number is an element of the set of rational numbers. 1 a. 2 b. c. 2 2 What other math symbol uses a slash mark to indicate the word not? Example: Graph the elements of each set on a number line. a. the set of integers b. { 1, 2 , 3 , 4}