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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}