%% 
%%  Example 04-01-13 
%%  Copyright (C) 2016 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{158.31393pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{delarray}
%StopShownPreambleCommands
\begin{document}
\[
  A=\begin{array}\{{cc}.
    a & b \\ c & d
    \end{array}
\]
\end{document}
