# Introduction

βThe concept of sets is basic to all mathematics and mathematical applications. This concept is very simple. We come across sets of different kinds in our daily life. For example, a class is a set of students. The Indian cricket team is a set of players. Thus, by a set we mean a collection of objects. However, in Mathematics, we define a set to be a well defined collection of objects. The meaning for well defined is given as looking at a set and an object it is possible to decide whether the object belongs to the collection or not.

**Georg Cantor
1845 - 1918 **