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+\documentclass{article}
+\usepackage{german}
+\setlength{\textwidth}{135mm}
+\begin{document}
+\noindent
+Laurent-Entwicklung: Mit $c_n = \frac{1}{2\pi i}
+\oint (\zeta-a)^{-n-1}f(\zeta)\,d\zeta$ gilt f"ur jede Funk\-tion $f(z)$ die
+Darstellung ($n=0$, $\pm1$, $\pm2$, \ldots)
+\[ f(x) = \sum_{n=-\infty}^{+\infty} c_n(z-a)^n
+ = \left\{\begin{array}{r}
+ c_0 + c_1(z-a) + c_2(z-a)^2 +\cdots+ c_n(z-a)^n+\cdots\\
+ \mbox{}+c_{-1}(z-a)^{-1} + c_{-2}(z-a)^{-2}+\cdots\\
+ \mbox{}+c_{-n}(z-a)^{-n}+\cdots \end{array}\right. \]
+\end{document}