Chapter 1 Basic Concepts of Sets 1.1 Sets and Subsets What are Sets? A collection of different objects is called a set S.A The individual objects in this collection are called the elements of the set We write "teA" to say that is an element of A, and We write“tea” to say that is not an element of AChapter 1 Basic Concepts of Sets 1.1 Sets and Subsets What are Sets? A collection of different objects is called a set S,A The individual objects in this collection are called the elements of the set We write “tA” to say that t is an element of A, and We write “tA” to say that t is not an element of A