# How to use real number(ℝ) symbol in LaTeX?

The real number symbol is represented by R’s bold font-weight or typestyle blackboard bold. However, in most cases the type-style of capital letter R is blackboard-bold.

SymbolReal Number Set
Type of symbolMathematics
Package (requirement)amsmath, amssymd, or texfonts
ArgumentYes, R
Latex command\mathbb{R}
Example\mathbb{R} → ℝ

## Use mathbb command in latex

To do this, you need to have \mathbb{R} command that is present in multiple packages. For example amsmath, amssymb, texfonts, and pxfonts.

\documentclass{article}
\usepackage{amssymb}
\begin{document}
$\mathbb{R}\in \left[a_1,a_n\right]$
$\mathbb{R}\in \left[S_1,S_n\right]$
$\mathbb{R}_1, \mathbb{R}^n,\mathbb{R}_{-*},\mathbb{R}_{+*}$
\end{document}

Output :

## Add superscript and subscript with real number

Positive real number and Negative real number symbols are denoted by ℝ+ and ℝ. Which, you can easily represent using the superscript with the \mathbb command.

\documentclass{article}
\usepackage{amssymb}
\begin{document}
$\mathbb{R}_{\geq 0} \in \mathbb{R}^+ \cup \{0\}$
$0 < \mathbb{R}^+ < \infty$
$-\infty < \mathbb{R}^- <0$
$\mathbb{R}_0 = \{0\}$
\end{document}

Output :

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