%% 
%%  Example 03-02-7 
%%  Copyright (C) 2016 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{158.31393pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands

%StopShownPreambleCommands
\begin{document}
\bgroup
\mathchardef\sum="1358
$a\sum\limits_{i=1}^{\infty}\sqrt{i+1}$\\[5pt]
\egroup

$a\sum\limits_{i=1}^{\infty}\sqrt{i+1}$
\end{document}
