%% 
%%  Example 01-22-1 
%%  Copyright (C) 2017 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{328.62788pt}

%StartShownPreambleCommands

%StopShownPreambleCommands
\begin{document}
\begin{minipage}[t]{0.45\linewidth}
\[
\sum_{\makebox[0pt]{$
       \scriptscriptstyle 1\le j\le p\atop {1\le j\le q\atop 1\le k\le r}$}%
     }a_{ij}b_{jk}c_{ki}
\]
\end{minipage}\hfill
\begin{minipage}[t]{0.45\linewidth}
\boldmath
\[
\sum_{\makebox[0pt]{$
       \scriptscriptstyle 1\le j\le p\atop {1\le j\le q\atop 1\le k\le r}$}%
     }a_{ij}b_{jk}c_{ki}
\]
$ y=f(x) $ \unboldmath $ y=f(x) $
\end{minipage}
\end{document}
