# Number Sets

In mathematics, often at the beginning of a text book or the start of a math class, number sets are discussed. This discussion is useful for laying a groundwork for proofs and formal logic.

## Natural Numbers

Natural numbers can be thought of as the “counting numbers”. They are associated with elementary mathematics and are one of the first things children are taught in school.

## Integers

The set of Integers introduces the idea of negative values. And importantly it is a superset of the natural numbers, meaning that it contains every number in the set of natural numbers, and has more elements of its own, the negative numbers.

## Rational Numbers

The set of Rational numbers contains all of the natural numbers as well as new values, fractions.

## Real Numbers

Real numbers build further and introduce numbers than cannot be expressed as a fraction of two integers. This type of number is often referred to as an irrational number.

## Complex Numbers

Complex Numbers….