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%% 
%%  An UIT Edition example
%% 
%%  Example 04-10-2 on page 58.
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\StartShownPreambleCommands
\usepackage{graphicx}
\StopShownPreambleCommands
\begin{document}
\[
\Delta = \| a_{ik} \| = \left|
\begin{array}{ccccc}
 a_{11} &a_{12} &a_{13} &\cdots &a_{1n}\\
 a_{21} &a_{22} &a_{23} &\cdots &a_{2n}\\
 \vdots &\vdots &\vdots &\ddots &\vdots\\
 a_{n1} &a_{n2} &a_{n3} &\cdots &a_{nn}
\end{array} \right|
\]
\end{document}