Abstract
This chapter discusses mathematical preliminaries. It also discusses set, relations, and functions. The most fundamental concept of classical mathematics is that of a set. The term set is roughly synonymous with those of class and collection. It refers to any arbitrary grouping of entities of any kind. The most important relation that may hold between two sets is the subset relation. A rectangular Cartesian coordinate system is a set of two or three straight lines that are mutually perpendicular and that intersect at a common point called the origin. These lines are called the axes of the system. The chapter presents the concept of vector algebra.
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