# How to Write Real Number (ℝ) Symbol in LaTeX

**To write a real number symbol (ℝ) in LaTeX, use the LaTeX command \mathbb{R}. It will add ℝ symbol in the text.**

The real number symbol ℝ represents the set of all real numbers, which includes all rational and irrational numbers.

In this article, we will discuss how to insert real number symbol (ℝ) in the LaTeX document and its significance in the mathematical expressions and scientific disciplines.

## Symbol Overview

**Symbol:** Real Number Symbol

**Unicode:** U+211D

**Type:** Mathematical

**Package Requirement:** None (built-in symbol with `amssymb`

package)

**Argument:** None (no additional arguments needed)

**LaTeX Command:** \mathbb{R}

**Example:** ℝ

## Syntax

To display the real number symbol (ℝ) in LaTeX, you can use the `\mathbb`

command from the `amssymb`

package. You will need to include the usepackage in your LaTeX document to use the `\mathbb`

command.

```
\usepackate{amssymb}
```

The command to display real number symbol:

```
\mathbb{R}
```

## Examples of Writing the Real Number (ℝ) Symbol

Let’s explore some of the practical examples of using the LaTeX command to write the real number symbol.

### Use Real Number Symbol (ℝ) to Specify Variable as Real Number

```
\documentclass{article}
\usepackage{amssymb}
\begin{document}
Let \( x \in \mathbb{R} \) represent a real number.
\end{document}
```

Output: 👇️

Let x ∈ ℝ represent a real number.

### Use Real Number Symbol to Denote the Range of a Function

```
\documentclass{article}
\usepackage{amssymb}
\begin{document}
The function \( g(x) = x^2 \) maps real numbers to positive real numbers, i.e., \( g: \mathbb{R} \rightarrow \mathbb{R}^+ \).
\end{document}
```

Output: 👇️

The function g(x) = x2 maps real numbers to positive real numbers, i.e.,g : ℝ → ℝ ^{+}.

## Conclusion

The real number (ℝ) symbol is a versatile symbol in mathematical expressions and scientific fields used to represent the set of all real numbers.

By using the `\mathbb`

command from the `amssymb`

package, you can write the real number in your LaTeX document.

The real number symbol is widely used in many applications such as mathematics, specify variables as real number, or indicate the range of a mathematical operation.

While using the real number symbol in your LaTeX document, ensure proper spacing around the preal number symbol to maintain readability.