Wetzel

Math 155

2.3 – Venn Diagrams and Set Operations

Venn Diagrams –

            Universal Set, U – all the elements being considered in a problem or example.

            Relationships –

                        1.  Disjoint Sets:  Two sets with no elements in common.

                        2.  Proper Subsets: 

                        3.  Equal Sets:  A = B

                        4.  Sets with common elements:  Set A and set B have at least one element in common.

            Complement of a set –

                        The complement of set A is the set of all elements in the universal set, but not in set A.

                        written

                        Ex.:  p.76 #5 - 16

            Intersection –

                        the set of all elements in both set A and set B is called the intersection.

                        written

            Union –

                        the set of all elements in set A or set B is called the union.

                        written

                        Ex.:  p.76 #17 – 92

HW:  p.76 #5 – 39odd, 67-77odd