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+%% 
+%%  An UIT Edition example
+%% 
+%%  Example 10-10-5 on page 224.
+%% 
+%%  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{375.57637pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+\usepackage{amsmath,amssymb}
+\makeatletter
+\def\underbraceMatrix{\@ifnextchar[{\underbraceM@i}{\underbraceM@i[4pt]}}
+\def\underbraceM@i[#1]#2{\underbraceM@ii{#2}{#1}}%
+\def\underbraceM@ii#1#2{\mathop{\vtop{\m@th\ialign{##\crcr
+   $\hfil\displaystyle{#1}\hfil$\crcr\noalign{\kern3\p@\nointerlineskip}%
+   \kern#2\upbracefill\kern#2\crcr\noalign{\kern3\p@}}}}\limits}
+\makeatother
+\StopShownPreambleCommands
+\begin{document}
+\[ \underbrace{%
+   \left(\begin{array}{cc}
+    A_{\cal E E} & A_{\cal E I}\\ A_{\cal I E} & A_{\cal I I}
+   \end{array}\right)}_{\textstyle=A}
+   \underbraceMatrix{%
+   \left(\begin{array}{cc}
+    A_{\cal E E} & A_{\cal E I}\\ A_{\cal I E} & A_{\cal I I}
+ \end{array}\right)}_{\textstyle=A}
+ \underbraceMatrix[1em]{%
+ \left(\begin{array}{cc}
+    A_{\cal E E} & A_{\cal E I}\\ A_{\cal I E} & A_{\cal I I}
+ \end{array}\right)}_{\textstyle=A} \]
+\end{document}