Definition:Natural Numbers

Informal Definition
The natural numbers are the counting numbers.

The set of natural numbers is denoted $\N$:
 * $\N = \set {0, 1, 2, 3, \ldots}$

The set $\N \setminus \set 0$ is denoted $\N_{>0}$:
 * $\N_{>0} = \set {1, 2, 3, \ldots}$

The set of natural numbers is one of the most important sets in mathematics.

Also see

 * Definition:Natural Number Addition