# How to write a permutation ?

How to write a permutation like this ?

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do you know how to utilize the pmatrix environment from amsmath package – percusse Jul 5 '13 at 22:07
– Werner Jul 5 '13 at 22:15

Consider using amsmath's smallmatrix:

\documentclass{article}
\usepackage{amsmath}% http://ctan.org/pkg/amsmath
\begin{document}
$a = \bigl(\begin{smallmatrix} 1 & 2 & 3 & \cdots & n-1 & n \\ 2 & 3 & 4 & \cdots & n & 1 \end{smallmatrix}\bigr)$
Here is another permutation $a = \bigl(\begin{smallmatrix} 1 & 2 & 3 & \cdots & n-1 & n \\ 2 & 3 & 4 & \cdots & n & 1 \end{smallmatrix}\bigr)$ in text mode.

\end{document}

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Using amsmath's pmatrix environment:

\documentclass{article}
\usepackage{amsmath}

\begin{document}
$a = \begin{pmatrix} 1 & 2 & 3 & \cdots & n-1 & n \\ 2 & 3 & 4 & \cdots & n & 1 \end{pmatrix}$
\end{document}


Another solution with matrix

\documentclass{article}
\usepackage{amsmath}

\begin{document}
$a = \left( \begin{matrix} 1 & 2 & 3 & \cdots & n-1 & n \\ 2 & 3 & 4 & \cdots & n & 1 \end{matrix} \right)$
\end{document}

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