%% 
%%  Example 03-02-1 
%%  Copyright (C) 2016 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{328.62788pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\def\tdela{\delimiter"4222378\relax}
\def\tdelb{\delimiter"5223379\relax}
%StopShownPreambleCommands
\begin{document}
$\tdela x-y\tdelb(x+y)=x^2-y^2$
%
\[\tdela\sum_{n=0}^\infty {1\over2^n}\tdelb^2 = 4\]
%
\[\left\tdela\sum_{n=0}^\infty {1\over2^n}\right\tdelb^2 = 4\]
\end{document}
