%% 
%%  Ein Beispiel der DANTE-Edition
%%  Mathematiksatz mit LaTeX
%%  3. Auflage
%%  Beispiel 07-14-2 auf Seite 150.
%%  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{352.81416pt}
\AtBeginDocument{\setlength\parindent{0pt}}
%StartShownPreambleCommands
\usepackage{nath,lmodern}
\def\X#1{%
   $ \csname#1\endcsname \huge\space \csname#1\endcsname $
    & \texttt{\textbackslash#1} & }
\newcommand\Xii[2][]{$ \double#2 \huge\space \double#2 $
    & \texttt{\textbackslash #1double#2} & }
\newcommand\Xiii[2][]{$ \triple#2 \huge\space \triple#2 $
    & \texttt{\textbackslash #1triple#2} & }
%StopShownPreambleCommands
\begin{document}
\def\arraystretch{2}
\begin{tabular}{@{}*{4}{r@{\kern3pt}l@{\kern2pt}}r@{\kern3pt}l@{}l@{}}
\X{lAngle} \X{rAngle} \X{lBrack} \X{rBrack} \X{lCeil}\\[3pt]
\X{rCeil}  \X{lFloor} \X{rFloor} \X{lVert}  \X{rVert}
\end{tabular}

\bigskip
\begin{tabular}{@{}*{3}{r@{\kern3pt}l@{\kern2pt}}r@{\kern3pt}l@{}l@{}}
\Xii[l]{|} \Xii[r]{|} \Xii{<}       \Xii{>} \\[3pt]
\Xii{[}    \Xii{]}    \Xiii[l]{|} \Xiii[r]{|} \\[3pt]
\Xiii{<} \Xiii{>} \Xiii{[}    \Xiii{]}
\end{tabular}
\end{document}