Natural numbers are positive numbers starting from 1 to ∞, represented by the ℕ symbol.
LaTeX does not have a built-in command for this symbol, so an external package is required. There are four LaTeX packages available, each using the same command to display ℕ.
The \mathbb{N} command requires the capital letter ℕ as its argument.
| Package | Command and output |
|---|---|
| amsfonts | \mathbb{N} → ℕ |
| amssymb | \mathbb{N} → ℕ |
| txfonts | \mathbb{N} → |
| pxfonts | \mathbb{N} →  |
In LaTeX, this can be written using the \mathbb{N} command from the amsfonts package. The following example shows how to properly format natural numbers in set notation.
\documentclass{article}
\usepackage{amsfonts}
\begin{document}
\[ \mathbb{N}=\{1,2,3,\ldots,\infty\} \]
\end{document}Output :
This notation clearly defines natural numbers as an infinite set of positive integers.
