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%%  Ein Beispiel der DANTE-Edition
%%  Mathematiksatz mit LaTeX
%%  3. Auflage
%%  Beispiel 10-03-3 auf Seite 216.
%%  Copyright (C) 2018 Herbert Voss
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%%  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.
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\documentclass[10pt]{screxa}
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\setlength\textwidth{146.40707pt}
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\begin{document}
$\lim\limits_{n->\infty}q^{n}=\left\{%
 \begin{array}{lc@{\kern2pt}c@{\kern2pt}r}
   \textrm{divergent}\  & q & \le & -1\\
       0 & |q| & < & 1\\
       1 &  q  & = & 1\\
       \infty  & q & > & 1
 \end{array}\right.$
\end{document}