NextPrevious

Foundations of Mathematics

Set Theory

What is a set?

Simply put, a set is a collection of objects or entities; these are called the elements of the set. The number of elements in a set can be large, small, finite, or infinite. The informal notation used for sets is sometimes seen as x = {y, z, …}, with brackets used to contain the elements within the set. It is stated as, “x is a set consisting of the elements y, z, and so on.” But more commonly, sets are seen as capital letters and elements as lowercase letters, such as a is an element of set A.



Close

This is a web preview of the "The Handy Math Answer Book" app. Many features only work on your mobile device. If you like what you see, we hope you will consider buying. Get the App