Sets and set operations
CS 441 Discrete Mathematics for CS Lecture 7
Sets and set operations
Milos Hauskrecht milos@cs.pitt.edu 5329 Sennott Square
CS 441 Discrete mathematics for CS
M. Hauskrecht
Basic discrete structures
? Discrete math = ? study of the discrete structures used to represent discrete objects
? Many discrete structures are built using sets ? Sets = collection of objects
Examples of discrete structures built with the help of sets: ? Combinations ? Relations ? Graphs
CS 441 Discrete mathematics for CS
M. Hauskrecht
1
Set
? Definition: A set is a (unordered) collection of objects. These objects are sometimes called elements or members of the set. (Cantor's naive definition)
? Examples: ? Vowels in the English alphabet V = { a, e, i, o, u } ? First seven prime numbers. X = { 2, 3, 5, 7, 11, 13, 17 }
CS 441 Discrete mathematics for CS
M. Hauskrecht
Representing sets
Representing a set by: 1) Listing (enumerating) the members of the set. 2) Definition by property, using the set builder notation {x| x has property P}.
Example: ? Even integers between 50 and 63.
1) E = {50, 52, 54, 56, 58, 60, 62} 2) E = {x| 50 ................
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