How to use diagonal three dots(⋱) symbol in LaTeX?

Symbol/UnicodeDiagonal three dots/U+22F1
Type of symbolDots
Package (requirement)No
ArgumentNo
Latex command\ddots
Example\ddots → ⋱

Many times we need diagonal three dots in our document. In Latex, you need to use the \ddots command for this.

\documentclass{article}
\usepackage{amsmath}
\begin{document}
   \[
   \begin{bmatrix}
      a_1 & \cdots & \\
      \vdots & \ddots & \\
       & & a_n
   \end{bmatrix}
   \]
\end{document}

Output :

Use diagonal dots in latex.

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