%% 
%%  Example 01-03-1 
%%  Copyright (C) 2017 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{134.31393pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands

%StopShownPreambleCommands
\begin{document}
\begin{equation}
  f(x)=\prod_{i=1}^{n}\left(i-\frac{1}{2i}\right)
\end{equation}
\end{document}
