%% 
%%  Example 02-11-5 
%%  Copyright (C) 2016 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{134.31393pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{mathtools}
%StopShownPreambleCommands
\begin{document}
\begin{align}
foo \left[
  \begin{array}{@{}c@{}}
    \displaystyle\sum_{\substack{i,j\\i>j}} \dots
  \end{array}\right] bar
\end{align}
\end{document}
