%%
%% Ein Beispiel der DANTE-Edition
%% Mathematiksatz mit LaTeX
%% 3. Auflage
%% Beispiel 10-04-3 auf Seite 218.
%% Copyright (C) 2018 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[10pt]{screxa}
\pagestyle{empty}
\setlength\textwidth{146.40707pt}
\AtBeginDocument{\setlength\parindent{0pt}}
%StartShownPreambleCommands
\usepackage{amsmath}
%StopShownPreambleCommands
\begin{document}
\fboxsep=0pt\begin{align*}
\hspace{1cm}\fbox{$\overbrace{\hspace{2cm}}^o$}%
\hspace{1cm}\\[-16pt]
\fbox{$\underbrace{\hspace{2cm}}_{u1}$}%
\fbox{$\underbrace{\hspace{2cm}}_{u2}$}
\end{align*}
\end{document}
