%% 
%%  Ein Beispiel der DANTE-Edition
%%  Mathematiksatz mit LaTeX
%%  3. Auflage
%%  Beispiel 04-18-5 auf Seite 71.
%%  Copyright (C) 2018 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% ==== 
% Show page(s) 1
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\documentclass[10pt]{screxa}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\AtBeginDocument{\setlength\parindent{0pt}}
%StartShownPreambleCommands

%StopShownPreambleCommands
\begin{document}
\parbox{0.49\linewidth}{%
\[ \sum_{\makebox[0pt]{${\scriptscriptstyle 1\le j\le p\atop {%
      {1\le j\le q\atop 1\le k\le r}}}$}}a_{ij}b_{jk}c_{ki} \]
}\hfill\parbox{0.49\linewidth}{\mathversion{bold}%
\[ \sum_{\makebox[0pt]{${\scriptscriptstyle 1\le j\le p\atop {%
      {1\le j\le q\atop 1\le k\le r}}}$}}a_{ij}b_{jk}c_{ki} \] }
\end{document}