%% 
%%  Example 03-03-3 
%%  Copyright (C) 2016 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{134.31393pt}

%StartShownPreambleCommands

%StopShownPreambleCommands
\begin{document}
$a\atop b$               \\[8pt]
$({n \atop k}) =
  {n!\above1pt k!(n-k)!}$\\[8pt]
$\displaystyle{a\atop b}$
\end{document}
