CHAPTER 1 SETS. What is a Set?. A set is a well-defined collection of distinct objects. The objects in a set are called the elements or members of the set. Capital letters A,B,C,… usually denote sets. Lowercase letters a,b,c ,… denote the elements of a set. Examples.
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Set A represented as a disk inside a
rectangular region representing U.
If A and B are finite sets,
See the preceding Venn diagram.