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### SetTheory2(Dr. Praveen Mittal).pdf

• 1. Discrete Mathematics BCSC1010 Module 1 Dr. Praveen Mittal Sets(Lecture2) Lecture Notes of Dr. Praveen Mittal
• 2. Cardinality of a set  The cardinality of a set is a measure of a set's size, i.e. the number of elements in the set.  If S is a set with n elements, where n is a nonnegative integer, then n is the cardinality of S. It is denoted by |S|. Thus, |S|=n Lecture Notes of Dr. Praveen Mittal
• 3. Cardinality of a set (Examples)  The set A = { 1 , 2 , 4 } has a cardinality of 3  Let A be the set of odd positive integers less than 10 Then IAI = 5  Let S be the set of letters in the English alphabets Then lSI = 26 Lecture Notes of Dr. Praveen Mittal
• 4. Cartesian Product Let A and B be sets The Cartesian product of A and B is the set of all ordered pairs (a, b), where a ϵ A and b ϵ B It is denoted by A x B Hence, A x B = {(a, b) | a ϵ A and b ϵ B} Lecture Notes of Dr. Praveen Mittal
• 5. Cartesian Product (Examples)  Example − If we take two sets A={a, b} and B={1, 2},  The Cartesian product of A and B is written as A×B={(a,1),(a,2),(b,1),(b,2)}  The Cartesian product of B and A is written as B×A={(1,a),(1,b),(2,a),(2,b)}  Note: A × B is not the same as B × A.  The cardinality of A × B is N*M, where N is the cardinality of A and M is the cardinality of B. Lecture Notes of Dr. Praveen Mittal
• 6. What is the Cartesian product A x B x C where A = {0, 1}, B = {1, 2}, and C = {0, 1, 2}? Solution  The Cartesian product A x B x C consists of all ordered triples (a, b, c), where a ϵ A, b ϵ B, and c ϵ C. Hence,  A x B x 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)} Lecture Notes of Dr. Praveen Mittal
• 7. Graphical representation of Sets  Sets can be represented graphically using Venn diagrams.  Named after the English mathematician John Venn, who introduced their use in 1881.  In Venn diagrams the universal set U, which contains all the objects under consideration, is represented by a rectangle. Lecture Notes of Dr. Praveen Mittal
• 8. Graphical representation of Sets  Inside this rectangle, circles or other geometrical figures are used to represent sets.  Sometimes points are used to represent the particular elements of the set.  Venn diagrams are often used to indicate the relationships between sets. Lecture Notes of Dr. Praveen Mittal
• 9. Venn diagram  Venn diagram that represents V, the set of vowels in the English alphabet. Lecture Notes of Dr. Praveen Mittal
• 11. Union of Sets Let A and B be sets The union of the sets A and B is the set that contains those elements that are either in A or in B, or in both  It is denoted by A U B AUB = {x | x A or x B} Lecture Notes of Dr. Praveen Mittal
• 12. Union of Sets (Examples) if A = {1, 3, 5, 7} and B = {1, 2, 4, 6, 7} Then A B = {1, 2, 3, 4, 5, 6, 7} The union of the sets {I, 3, 5} and {I, 2, 3}  {I, 3, 5} U {I, 2, 3} = {I, 2, 3, 5} Lecture Notes of Dr. Praveen Mittal
• 13. Union of Sets (Graphical Representation) Lecture Notes of Dr. Praveen Mittal
• 14. = {3, 5, 7, 2} Lecture Notes of Dr. Praveen Mittal
• 15. Intersection of Sets Let A and B be sets The intersection of the sets A and B is the set containing those elements in both A and B It is denoted by A B A B = {x | x A and x B} Lecture Notes of Dr. Praveen Mittal
• 16. Intersection of Sets (Example) The intersection of the sets {1, 3, 5} and {1, 2, 3} {1, 3, 5} {l, 2, 3} = {l,3} Lecture Notes of Dr. Praveen Mittal
• 17. Intersection of Sets Lecture Notes of Dr. Praveen Mittal
• 18. = {3, 5} Lecture Notes of Dr. Praveen Mittal
• 19. Difference of Sets Let A and B be two sets The difference of A and B is the set containing those elements that are in A but not in B It is denoted by A - B A - B = {x | x A and x B} Lecture Notes of Dr. Praveen Mittal
• 20. Difference of Sets (Examples) {1, 3, 5} - {1, 2, 3} = {5} { 1, 2, 3} - {1, 3, 5}= {2} Lecture Notes of Dr. Praveen Mittal
• 21. B B Example If A={10,11,12,13} and B={13,14,15}, then (A−B)={10,11,12} and (B−A)={14,15}. Here, we can see (A−B)≠(B−A) Lecture Notes of Dr. Praveen Mittal
• 22. = {7} = {2} Lecture Notes of Dr. Praveen Mittal
• 23. Complement of a set  Let U be the universal set.  The complement of the set A, denoted by , is the complement of A with respect to U.  In other words, the complement of the set A is U - A.  An element belongs to if and only if x A.  = {x U : x A} Lecture Notes of Dr. Praveen Mittal
• 24. Complement of a set Lecture Notes of Dr. Praveen Mittal
• 25. Complement of a set (Examples) Let A = {a, e, i, o, u} (where the universal set is the set of letters of the English alphabet). Then,  = {b, c, d, j, g, h, j, k, I, m, n, p, q, r, s, t, v, w, x, y, z} Let A be the set of positive integers greater than 10 Lecture Notes of Dr. Praveen Mittal
• 26. Disjoint Sets Two sets A and B are called disjoint sets if they do not have even one element in common. Two sets are called disjoint if their intersection is the empty set. Example Let A = {l, 3, 5, 7, 9} and B = {2, 4, 6, 8, 10} Since, A B = Φ, A and B are disjoint Lecture Notes of Dr. Praveen Mittal
• 27. Disjoint Sets Lecture Notes of Dr. Praveen Mittal
• 28. Generalized Unions The union of a collection of sets is the set that contains those elements that are members of at least one set in the collection. To denote the union of the sets , ... , , we use the notation Lecture Notes of Dr. Praveen Mittal
• 29. Generalized Intersections  The intersection of a collection of sets is the set that contains those elements that are members of all the sets in the collection.  To denote the intersection of the sets , ... , , we use the notation Lecture Notes of Dr. Praveen Mittal
• 30. Lecture Notes of Dr. Praveen Mittal Example
• 31. Next Topic… Proof Techniques Lecture Notes of Dr. Praveen Mittal
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