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## 2.3 Set Operations Objectives:

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**2.3 Set Operations Objectives:**• Be able to perform the set operations of union, intersection, complement, and difference • Understand the order in which to perform set operations • Know how to apply DeMorgan’s laws in set theory • Use Venn diagrams to prove or disprove set theory statements • Calculate the cardinal number of the union of two sets**Union of Sets cont.**• Example: Find the union of the two sets. • Find the union of the two sets. • A = { x : x is the opposite of a natural number } • B = { x : x is a whole number } ____________________________________________ ?**Intersection of Sets cont.**• Example: Find the intersection of the two sets. • Find the intersection of the two sets. • A = { x : x is the opposite of a natural number } • B = { x : x is a whole number } ____________________________________________ ?**Set Complement**Note: Think of A complement as not A .**Set Complement cont.**• Example: Given U and A, find the complement of A. • Given U and A, find the complement of A. • U = { x : x is a real number } • A = { x : x > 3.1 } • A’ = _________________________________ ?**Set Difference**B - A Note 1: Think of B – A as what is in B “take away” what is in A . Note 2: B – A A – B !**Set Difference cont.**• Example: Find the difference. • Find the differences. • A = { x : x is an integer } • B = { x : x is a natural number } • A – B = ________________________________ ? • B – A = ________________________________ ?**Order of Set Operations**• Similar to Order of Operations for arithmetic. • Example: Let**Order of Set Operations cont.**• Similar to Distributive Property of Multiplication over Addition. a( b + c ) = ________________________ ? • Intersection distributes over union. • Use Venn diagrams to show**DeMorgan’s Laws**Use Venn diagrams to prove DeMorgan’s Laws for sets.**Cardinality of a Union**Let A = { 1, 2, 3 } and B = { 3, 4, 5 } Then _________________________ ? and n( ) = _________ ? n ( ) =