# THE LANGUAGE OF SETS AND SET NOTATION

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2 nother way to write sets is to use set-builder notation. In this case set E would be written E = {x x is an even whole number}. This is read: E = { x x is an even whole number} "E is the set of all x, such that x is an even whole number." Note that the vertical bar is read, "such that." Equivalently, E = {x W x is even} This can be read: E = { x W x is even} "E is the set of all whole numbers x such that x is even," or more simply, "the set of all even whole numbers." (W is the symbol or name commonly used for the set of whole numbers.) To indicate that an element is not a member of the set, we put a slash through the "element of" symbol. For example, 1 {2,3,4,5,6,7} and 5 {0,10,20}. There are two special sets that need to be considered. The first is the set that contains every element under consideration. It is called the universal set and is often denoted by. The other is the set with no elements; it is called the empty set or null set and is denoted by { } or Ø. One of the most important relationships between sets is the notion of a subset of a set. We will say that a set is a subset, denoted by, if every element of is also an element of. The set is said to be a proper subset of if is a subset of but is not equal to. Consider the universal set = {2,4,6,8,10}. Then the sets to be considered will have members from this set; they will be subsets of the universal set. Here are some examples of sets in this universe: = {2,4,6} = {2,4,6,8} C = {2,6,10} Note that,, and C since all the elements of,, and C are contained in. lso, since every element in is also in. However, is not a subset of C since 4 but 4 C. Likewise C since 10 C but 10. Do not confuse the notions of "element" and "subset." That is, 2 C, but the number 2 is not a subset of C (2 C). On the other hand, the set whose only member is 2, written {2}, is a subset of C ({2} C). Just how many subsets does C have? Since C = {2,6,10}, we can list them: { }, {2}, {6}, {10}, {2,6}, {2,10}, {6,10}, {2,6,10} The number of elements in a set is called the cardinality of the set. The cardinality of the empty set is 0 since it has no elements. If a set is denoted by, then its cardinality will be denoted by n(). For example, for C = {2,6,10}, n(c) = 3. Two different sets can have the same cardinality; in this case we say there is a one to one correspondence between the two sets. That is, we can "match up'" the elements of one set with the elements of the other, one by one. " picture is worth a thousand words," and one useful way to "picture" sets and their relationships is with figures called Venn diagrams. In a Venn diagram the universal set is frequently represented by a rectangle with the proper sets in the universe represented by circles. The Language of Sets and Set Notation 2 of 7

3 (FIGRE 1) Venn diagram We can illustrate relationships between sets with appropriate Venn diagrams. (FIGRE 2) Venn diagrams for subsets When and have no elements in common, we say they are disjoint. If the sets have elements in common, then they overlap or intersect. (FIGRE 3) Venn diagrams for disjoint and intersecting sets Disjoint sets Intersecting sets Often we are given two sets X and Y, and we don't know if or how they are related. In this case we draw a general figure. (FIGRE 4) Venn diagram showing general sets X Y The Language of Sets and Set Notation 3 of 7

4 Let's label the different regions of this diagram: (FIGRE 5) We have to be careful when we make a general diagram to remember that there are several possibilities for each region. For example, just because we have drawn X and Y as overlapping sets does not mean that they must overlap. In fact, we have the following possibilities: X or Y or both may be the empty set. If X Y, then region 2 is empty. If Y X, then region 4 is empty. lf X = Y, then both regions 2 and 4 are empty. If X and Y are disjoint, then region 3 is empty. Three common operations are performed on sets: union, intersection, and complementation. nion is the operation that combines two sets; the union of the sets and is the set that consists of all the elements of and in addition all the elements of. The symbol for union is and we write. The intersection of the sets and is the set containing all the elements that are common to both sets and is denoted. The complement of a set is the set of all elements in (the universe) and not in. We will denote the complement of a set by adding a prime: '. (Other books will use may use other notations, such as ~ or.) sing set notation we have these definitions: The union of the sets and = = {x x or x } The intersection of and = = {x x and x } The complement of a set = ' = {x x and x } Let's recall the sets we considered on page 2. = {2,4,6,8,10} = {2,4,6} ={2,4,6,8} C ={2,6,10} For the given sets,, and C and universe, we have: = {2,4,6,8} = {2,4,6} ' = {8,10} C = {2,4,6,10} C = {2,6} ' = {10} C = {2,4,6,8,10} C = {2,6} C' = {4,8} The Language of Sets and Set Notation 4 of 7

5 We can also draw Venn diagrams to describe each of these operations. When we illustrate the union of two sets and, first shade and then shade. The union is all the parts that have been shaded. (FIGRE 6) Venn diagram showing the union of the sets and Intersection also can be illustrated using the Venn diagram. This time shade the set in one direction or color and then shade the set in another direction or color. The set is the set that has been shaded twice. (FIGRE 7) Venn diagram showing the intersection of and. Complementation, too, can be shown using a Venn diagram. In this case, the area outside the given set is shaded. (FIGRE 8) Venn diagram showing the complement of the set. ' The Language of Sets and Set Notation 5 of 7

6 PROLEM SET List all subsets of each set given in Problems φ 2. {1,2} 3. {2,4} 4. {2,4,6} 5. {2,5,7} How many subsets do each of these sets have? 6. {1,2,3,4} 7. {a,e,i,o,u} 8. {1,3,5,7,9,11} se the following sets to answer the questions that follow. = {1,2,3,4,5,6,7,8,9,10} X = {2,4,6,8,10} Y = {5,6,7} Z = {1,3,5,7,9} TRE OR FLSE? 9. X Y 13. X and Z are disjoint. l0. X Z X II. Y X 15. {1,3} Z Y 16. { } X List all the members of each set in problems X Z 20. Y' 23. Y Z 18. X Y 21. X Z 24. Y Z 19. X' 22. X Y 25. Z' Draw a Venn diagram for each relationship in problems X Z 28. Y Z 30. X Y 27. X Y 29. X Z 31. Y Z 32. X' 33. Y', 34. Z' List the members of each of these sets. 35. {x x W and x< 6} 36. {x x W and -1 < x < 4} 37. {x x W and x is a multiple of 3} {x x W and x < 10} 38. {x x W and -1 < x < 4} {x x W and -5 < x < 2} The Language of Sets and Set Notation 6 of 7

7 nswers to the odd problems 1. φ 3. φ,{2}, {4}, {2,4} 5. φ, {2}, {5}, {7}, {2,7},{2,5},{5,7}, {2,5,7} false 11. false 13. true 15. false 17. none 19. {1,3,5,7,9} 21. {1,2,3,4,5,6,7,8,9,10} 23. {5,7} 25. {2,4,6,8,10} X 2,4 8,10 6 Y 5,7 X 2,4,6,8, 10 Z 1,3,5,7, Y 6 Z 5 7 1,3,9 Y 5,6,7 35. {0,1,2,3,4,5} 37. {0,3,6,9} The Language of Sets and Set Notation 7 of 7

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