%% 
%%  Ein Beispiel der DANTE-Edition
%%  Mathematiksatz mit LaTeX
%%  3. Auflage
%%  Beispiel 04-02-3 auf Seite 38.
%%  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
%% 
%% 
\documentclass[10pt]{screxa}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}

%StartShownPreambleCommands
\usepackage{kbordermatrix}
%StopShownPreambleCommands
\begin{document}
\kbordermatrix{%
  &(1\cdot11) &(1\cdot12) &(1\cdot22) &\vrule&(2\cdot11)&(2\cdot12)&(2\cdot22)\\
 (1)       &\lambda(1)^2&2\lambda(1)\lambda(2)&\lambda(2)^2&\vrule&0&0&0\\
 (2)       &0 &0  &0  & \vrule&\lambda(1)^2&2\lambda(1)\lambda(2)&\lambda(2)^2\\\hline
 (111)     &3 & 0 & 0 & \vrule & 0 & 0 & 0\\
 (112)     &0 & 2 & 0 & \vrule & 1 & 0 & 0\\
 (122)     &0 & 0 & 1 & \vrule & 0 & 2 & 0\\
 (222)     &0 & 0 & 0 & \vrule & 0 & 0 & 3}
\end{document}