%%
%% A DANTE-Edition example
%%
%% Example 30-02-11 on page 591.
%%
%% Copyright (C) 2011 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[]{article}
\pagestyle{empty}
\setlength\textwidth{153.70511pt}
\setlength\parindent{0pt}
\usepackage{pstricks-add,amsmath}
\begin{document}
\[\begin{pmatrix}
\Rnode[vref=2ex]{A}{~1} \\
& \ddots \\ && \Rnode[href=2]{B}{1} \\
&&& \Rnode[vref=2ex]{C}{0} \\
&&&& \ddots \\ &&&&& \Rnode[href=2]{D}{0}~ \\
\end{pmatrix}\]
\psset{linewidth=0.1pt,rot=-90,nodesep=-0.4}\small
\psbrace(B)(A){n times} \psbrace(D)(C){n times}
\end{document}
