%%
%% A DANTE-Edition example
%%
%% Example 06-00-24 on page 191.
%%
%% Copyright (C) 2010 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[]{article}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\setlength\parindent{0pt}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{array,slashbox,ragged2e}
\begin{document}
\renewcommand\arraystretch{1.6}
\begin{tabular}{|*{4}{>{%
\Centering$}m{12mm}<{$}|}}\hline
\multicolumn{1}{|c|}{%
\backslashbox{$v_n$}{$u_n$}}
& \ell&+\infty&-\infty\\\hline
\ell' &\ell+\ell'&+\infty&-\infty\\\hline
+\infty&+\infty&+\infty&$F.I.$\\\hline
-\infty&-\infty&$F.I.$&-\infty\\\hline
\end{tabular}
\end{document}
