1. Unions and Intersections of Sets Chapter 3 Section 8

2. Union  A union of two or more sets is the set that contains all elements of the sets  The symbol for union is: U  Anything that is in either set is in the Union  A union of two or more sets is the set that contains all elements of the sets  The symbol for union is: U  Anything that is in either set is in the Union

3. Venn Diagram AB

4. Turn to Page 215  Look at Problem 1  Try the “Got It” problem for this example  Look at Problem 1  Try the “Got It” problem for this example

5. Intersection  The intersection of two or more sets is the set of elements that are common to every set.  An element is in the intersection if it belongs to all the sets  The symbol is ∩  The intersection of two or more sets is the set of elements that are common to every set.  An element is in the intersection if it belongs to all the sets  The symbol is ∩

6. Venn Diagram AB ∩

7. Disjoined Sets  Have no elements in common  Their intersection is the empty set.  Have no elements in common  Their intersection is the empty set.

8. On page 216…  Look at problem 2 and 3  Try the “Got It” problems.  Look at problem 2 and 3  Try the “Got It” problems.

9. On page 218…  Try Problems #1-9 on your own.