Set of real number is represented by the ℝ symbol. For this, you need to pass argument `R`

in `\mathbb`

command in latex.

Symbol | Real numbers |
---|---|

Type | Set symbol |

Package | asmmath,… etc |

Command | `\mathbb{R}` |

Example | `\mathbb{R}` → ℝ |

In latex, this `\mathbb`

command is located in more than one package. So, you look at this table below

amsfonts | `\mathbb{R}` → |

amssymb | `\mathbb{R}` → |

txfonts | `\mathbb{R}` → |

pxfonts | `\mathbb{R}` → |

Real number symbol structure is the same for `amsfonts`

and `amssymb`

packages but slightly different for `txfonts`

and `pxfonts`

packages.

```
\documentclass{article}
\usepackage{amsfonts}
\begin{document}
\[ a,b\in\mathbb{R} \]
\end{document}
```

**Output :**

## Real part from complex number in LaTeX

A complex number is made up of two parts, real and complex. And the real part is identified by **ℜ(z)** symbol. By default, the `\Re(z)`

command is used to define this **ℜ(z)** symbol

```
\documentclass{article}
\begin{document}
\[ z=a+ib \]
\[ \Re(z) = a \]
\end{document}
```

**Output :**

You can denote real part symbols using more different methods instead of the default method in latex. For example

**1.** Using a `physics`

package that contains `\Re`

command to denote the real part. And `\Re`

command return **Re**(**z**) symbol instead of **ℜ**(**z**) symbol.

```
\documentclass{article}
\usepackage{physics}
\begin{document}
\[ z = a+ib \]
\[ \Re(z) = a \]
\end{document}
```

**Output :**

**2.** Secondly, you use `amsmath`

package. And re-syntax must be passed into `\operatorname`

command.

```
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[ z = a+ib \]
\[ \operatorname{Re}(z) = a \]
\end{document}
```

**Output :**

**3.** Thirdly being `amsfonts`

can be used to present `\mathfrak`

command. And you can pass both `R`

and `Re`

as arguments in this `\mathfrak`

command.

```
\documentclass{article}
\usepackage{amsfonts}
\begin{document}
\[ z = a+ib \]
\[ \mathfrak{R}(z) = a \]
\[ \mathfrak{Re}(z) = a \]
\end{document}
```

**Output :**

If you look at the above outputs, you will understand that it is best to use **Re**(**z**) instead of **ℜ**(**z**) to denote the real part symbol. And for this, using `physics`

package and `\Re`

command is the best practice.