## Abstract

The purpose of this chapter is to present a very brief review of some basic set-theoretic concepts that will be needed in the sequel. By basic concepts we mean standard notation and terminology, and a few essential results that will be required in later chapters. We assume the reader is familiar with the notion of *set* and *elements* (or *members*, or *points*) of a set, as well as with the basic set operations. It is convenient to reserve certain symbols for certain sets, especially for the basic *number systems*. The set of all *nonnegative integers* will be denoted by ℕ_{0}, the set of all *positive integers* (i.e., the set of all *natural numbers*) by ℕ, and the set of all *integers* by ℤ. The set of all *rational numbers* will be denoted by ℚ the set of all *real numbers* (or the *real line)* by ℝ, and the set of all *complex numbers* by ℂ.

## Keywords

Equivalence Relation Arbitrary Element Complete Lattice Injective Function Cardinal Number## Preview

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