ITM 107 Lecture Notes - Lecture 1: Natural Number, Null Set, Khan Academy

• School: Ryerson University
• Department: Information Technology Management
• Course: ITM 107
• Professor: Aziz Guergachi

Document Summary

One way is by listing the elements of the set. We can specify a set by listing them. To say 4 is a set of a; a=4 - to say 5 is not a set of a; a =/= 5. If a set contains no element, it is called an empty set or the null set it is denoted by o with a / striking through it. X and y are equal if they have the same elements. The assumption is always made that the sets under discussion are all subsets of some larger set called universal. A set that contains the members of two sets (a and b) is called the intersection. The intersection of a and b, is written as a n b. A n b= {x; x e a and x e b} The union two sets is the set that contains all members of the two sets.