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## Chapter 7. Sets

Sets are collections of distinguishable objects, called members, grouped together because they are in some way related. Two important characteristics of sets are that their members are unordered and that no members occur more than once. Sets are an important part of discrete mathematics, an area of mathematics particularly relevant to computing. In computing, we use sets to group data, especially when we plan to correlate it with other data in the future. Some languages, such as Pascal, support sets intrinsically, but C does not. Therefore, this chapter presents a set abstract datatype.

This chapter covers:

Set principles

The fundamental mathematics describing sets. Like other mathematical objects, sets can be described in terms of some definitions, basic operations, and properties.

Sets

Abstract datatypes based on the mathematical concept of a set. Sets are unordered collections of related members in which no members occur more than once.

Some applications of sets are:

Data correlation

Determining interesting relationships between sets of data. For example, the intersection of two sets tells which members are present in both sets. The difference of two sets tells which members of the first set do not appear in the second set.

Set covering (illustrated in this chapter)

An optimization problem that nicely models many problems of combinatorics and resource selection. For example, imagine trying to form a team from a large set of candidate players, each with a certain set of ...

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