# Sec\$on Summary. Definition of sets Describing Sets

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1 Section 2.1

2 Sec\$on Summary Definition of sets Describing Sets Roster Method Set-Builder Notation Some Important Sets in Mathematics Empty Set and Universal Set Subsets and Set Equality Cardinality of Sets Tuples Cartesian Products 2

3 Introduc\$on Sets are one of the basic building blocks for the types of objects considered in discrete mathematics. Important for counting. Programming languages have set operations. Set theory is an important branch of mathematics. Many different systems of axioms have been used to develop set theory. Here we are not concerned with a formal set of axioms for set theory. Instead, we will use what is called naïve set theory. 3

4 Sets A set is an unordered collection of objects. the students in this class the chairs in this room The objects in a set are called the elements, or members of the set. A set is said to contain its elements. The notation a A denotes that a is an element of the set A. If a is not a member of A, write a A 4

5 Describing a Set: Roster Method S = {a,b,c,d} Order not important S = {a,b,c,d} = {b,c,a,d} Each distinct object is either a member or not; listing more than once does not change the set. S = {a,b,c,d} = {a,b,c,b,c,d} Elipses ( ) may be used to describe a set without listing all of the members when the pattern is clear. S = {a,b,c,d,,z } 5

6 Roster Method Set of all vowels in the English alphabet: V = {a,e,i,o,u} Set of all odd positive integers less than 10: O = {1,3,5,7,9} Set of all positive integers less than 100: S = {1,2,3,..,99} Set of all integers less than 0: S = {., -3,-2,-1} 6

7 Some Important Sets N = natural numbers = {0,1,2,3.} Z = integers = {,-3,-2,-1,0,1,2,3, } Z+ = positive integers = {1,2,3,..} Q = set of rational numbers R = set of real numbers R + = set of positive real numbers C = set of complex numbers. C R Q Z N 7

8 Set-Builder Nota\$on Specify the property or properties that all members must satisfy: S = {x x is a positive integer less than 100} O = {x x is an odd positive integer less than 10} O = {x Z+ x is odd and x < 10} A predicate may be used: S = {x P(x)} Example: S = {x Prime(x)} Positive rational numbers: Q + = {x R x = p/q, for some positive integers p,q} 8

9 Interval Nota\$on [a,b] = {x a x b} [a,b) = {x a x < b} (a,b] = {x a < x b} (a,b) = {x a < x < b} closed interval [a,b] open interval (a,b) [2, 7] [2, 7) (2, 7] (2, 7)

10 Universal Set and Empty Set The universal set U is the set containing everything currently under consideration. Sometimes implicit Sometimes explicitly stated. Contents depend on the context. The empty set is the set with no elements. Symbolized, but {} also used. Venn Diagram V a e i o u U John Venn ( ) Cambridge, UK 10

11 Russell s Paradox Let S be the set of all sets which are not members of themselves. A paradox results from trying to answer the question Is S a member of itself? Related Paradox: Henry is a barber who shaves all people who do not shave themselves. A paradox results from trying to answer the question Does Henry shave himself? Bertrand Russell ( ) Cambridge, UK Nobel Prize Winner 11

12 Some things to remember Sets can be elements of sets. {{1,2,3},a, {b,c}} {N,Z,Q,R} The empty set is different from a set containing the empty set. { } 12

13 Set Equality Definition: Two sets are equal if and only if they have the same elements. Therefore if A and B are sets, then A and B are equal if and only if. We write A = B if A and B are equal sets. {1,3,5} = {3, 5, 1} {1,5,5,5,3,3,1} = {1,3,5} 13

14 Subsets Definition: The set A is a subset of B, if and only if every element of A is also an element of B. The notation A B is used to indicate that A is a subset of the set B. A B holds if and only if 1. Because a is always false, S, for every set S. 2. Because a S a S, S S, for every set S. is true. U A B B A 14

15 Showing a Set is or is not a Subset of Another Set A is a Subset of B: To show A B, show that if x belongs to A, then x also belongs to B. A is not a Subset of B: To show A B, find an element x A such that x B. (Such an x is a counterexample to the claim that x A implies x B.) Examples: 1. The set of all computer science majors at your school is a subset of all students at your school. 2. The set of integers with squares less than 100 is not a subset of the set of nonnegative integers. 15

16 Another look at Equality of Sets Recall that two sets A and B are equal, denoted by A = B, iff Using logical equivalences we have that A = B iff This is equivalent to A B and B A 16

17 Proper Subsets Definition: If A B, but A B, then we say A is a proper subset of B, denoted by A B. If A B, then is true. Venn Diagram B A U 17

18 Set Cardinality Definition: If there are exactly n distinct elements in S where n is a nonnegative integer, we say that S is finite. Otherwise it is infinite. Definition: The cardinality of a finite set A, denoted by A, is the number of (distinct) elements of A. Examples: 1. ø = 0 2. Let S be the letters of the English alphabet. Then S = {1,2,3} = 3 4. {ø} = 1 5. The set of integers is infinite. 18

19 Power Sets Definition: The set of all subsets of a set A, denoted P(A), is called the power set of A. Ex: If A = {a,b} then P(A) = {ø, {a},{b},{a,b}} If a set has n elements, then the cardinality of the power set is 2ⁿ. (In Ch. 5 and 6, we ll discuss different ways to show this.) 19

20 Tuples The ordered n-tuple (a 1,a 2,..,a n ) is the ordered collection that has a 1 as its first element and a 2 as its second element and so on until a n as its last element. Two n-tuples are equal if and only if their corresponding elements are equal. 2-tuples are called ordered pairs. The ordered pairs (a,b) and (c,d) are equal if and only if a = c and b = d. 20

21 René Descartes ( ) Cartesian Product Definition: The Cartesian Product of two sets A and B, denoted by A B is the set of ordered pairs (a,b) where a A and b B. Example: A = {a,b} B = {1,2,3} A B = {(a,1),(a,2),(a,3), (b,1),(b,2),(b,3)} B A = {(1,a),(1,b), (2,a),(2,b), (3,a),(3,b)} Definition: A subset R of the Cartesian product A B is called a relation from the set A to the set B. (More in Chapter 9. ) 21

22 Cartesian Product Definition: The cartesian products of the sets A 1,A 2,,A n, denoted by A 1 A 2 A n, is the set of ordered n-tuples (a 1,a 2,,a n ) where a i belongs to A i for i = 1, n. Ex: What is A B C where A = {0,1}, B = {1,2} and C = {0,1,2} Solution: A B C = {(0,1,0), (0,1,1), (0,1,2),(0,2,0), (0,2,1), (0,2,2),(1,1,0), (1,1,1), (1,1,2), (1,2,0), (1,2,1), (1,2,2)} 22

23 Set Nota\$on with Quan\$fiers x S (P(x)) is shorthand for x(x S P(x)) x S (P(x)) is shorthand for x(x S P(x)) Ex: Express the following in English 1. x R (x 2 0) The square of every real number is nonnegative. 2. x Z (x 2 = 1) There is an integer whose square is one. 23

24 Truth Sets and Quan\$fiers Given a predicate P and a domain D, we define the truth set of P to be the set of elements in D for which P(x) is true. The truth set of P(x) is denoted by Ex: The truth set of P(x) where the domain is the integers and P(x) is x = 1 is the set {-1,1} 24

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