%% 
%%  Der Mathematiksatz mit LaTeX, 1. Auflage 2009
%% 
%%  Example 4-10-2 on page 60.
%% 
%%  Copyright (C) 2009 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.
%% 

\documentclass[]{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{194.59192pt}
\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}
