%% 
%%  Example 04-01-27 
%%  Copyright (C) 2016 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{158.31393pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{graphicx}
\def\Sum{\ensuremath\mathop{%
  \scalebox{1.2}{$\displaystyle\sum$}}}
%StopShownPreambleCommands
\begin{document}
\[ \Sum_{j=1}\sum_{i=1}^\infty i \]
\end{document}
