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diff --git a/Master/texmf-doc/doc/german/kopka/uebungen/kapitel5/ueb5-11.tex b/Master/texmf-doc/doc/german/kopka/uebungen/kapitel5/ueb5-11.tex
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+\documentclass{article}
+\usepackage{german}
+\setlength{\textwidth}{135mm}
+\begin{document}
+\begin{equation}
+\lim_{x\to0}\frac{\sqrt{1+x} - 1}{x} =
+\lim_{x\to0}\frac{(\sqrt{1+x} - 1)(\sqrt{1+x} + 1)}{x(\sqrt{1+x} + 1)} =
+\lim_{x\to0}\frac{1}{\sqrt{1+x} + 1} = \frac{1}{2}
+\end{equation}
+\begin{equation}
+\frac{\partial^2 U}{\partial x^2} + \frac{\partial^2 U}{\partial y^2} = 0\quad
+\Longrightarrow\quad 
+U_M = \frac{1}{4\pi}\oint\limits_\Sigma\frac{1}{r}\frac{\partial U}{\partial n}
+\,ds - \frac{1}{4\pi}\oint\limits_\Sigma\frac{\partial\frac{1}{r}}{\partial n}
+U\,ds
+\end{equation}
+\end{document}