**Latex diagonal dots** are the sum of three dots located along the diagonal. This diagonal dots symbol is represented by the \ddots command.

Properties | Value |

Symbol | Diagonal dots |

Package | Default |

Command | `\ddots` |

Argument | No |

Example | `\ddots` → |

These diagonal dots are used to represent a matrix with n number of elements.

```
\documentclass{article}
\begin{document}
\[ \ddots \]
\end{document}
```

**Output :**

And you see the diagonal matrix where the elements of the matrix are arranged just along the diagonal. In that case, only the latex diagonal dots symbol is used.

```
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[ \begin{bmatrix}
a_{1} & & \\
& \ddots & \\
& & a_{n}
\end{bmatrix}\]
\end{document}
```

**Output :**

## Inverse diagonal dots

Inverse diagonal dots are located in a diagonal direction from south-west to north-east.

Latex has more than one command and method to represent this inverse diagonal dots symbol.

Package | command |

MySymbol | `\udots` |

Mathdots | `\iddots` |

yhmath | \adots |

graphicx | `\reflectbox{...}` |

```
\documentclass{article}
\usepackage{graphicx}
\usepackage{yhmath}
\usepackage{mathdots}
\usepackage{MnSymbol}
\begin{document}
\[ \iddots \]
\[ \udots \]
\[ \adots \]
\[ \reflectbox{$\ddots$} \]
\end{document}
```

**Output :**

$\ddots$ is passed as an argument in \reflectbox command which converts **diagonal dots symbol** to **inverse diagonal dots symbol.** And for this you need to take the help of graphicx package.