%% 
%%  Example 04-01-15 
%%  Copyright (C) 2016 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{158.31393pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{empheq}
%StopShownPreambleCommands
\begin{document}
\begin{empheq}[box=\fbox]{align}
  f(x)=\int\limits_1^{\infty}\frac{1}{x^2}\,\mathrm{d}x=1
\end{empheq}
\end{document}
