PHL246H1 Study Guide - Quiz Guide: Kathleen Wynne, Bracket, Empty Set
Document Summary
Intuitively, a set is a collection of objects (things, entities). For instance, the set c of canadian cities with a population of more than 1 million is the set containing toronto, montreal, and calgary. We use curly brackets {" and }" to denote sets. One way to describe c is as follows: c = {toronto, montreal, calgary}. A different way to describe the very same set t is as follows: c = {x: x is a canadian city with a population of more than 1 million}. The order in which the members are listed does not matter: c = {toronto, montreal, calgary} = {calgary, Nor does it matter if a member is listed once or more than once: c = {toronto, toronto, montreal, We use the symbol " to denote that an object is a member of a set, and the symbol " to denote that an object is not a member of a set: toronto c, but vancouver c.
