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+\documentclass[30pt,landscape]{foils}
+\usepackage[pdftex]{geometry}
+\geometry{headsep=3ex,hscale=0.9}
+\usepackage[pdftex]{color} % for the colored block
+\usepackage{pause}
+\rightfooter{} % no more page numbers bottom right
+\MyLogo{} % no logo bottom left
+\begin{document}
+\foilhead{Eine schrittweise aufgebaute Formel}
+\[
+ Q(n) = \sum_{i=1}^{n}i^{2} =
+ \frac{1}{3}n(n+\frac{1}{2})(n+1)\pause
+\]
+\begin{eqnarray*}
+\left|\frac{1}{3}n^3 + \frac{1}{2}n^{2}+\frac{1}{6}n\right|
+ &\leq&\left|\frac{1}{3}n^3\right|+\left|\frac{1}{2}n^{2}\right|+
+ \left|\frac{1}{6}n\right|\pause\\
+ &\leq&\frac{1}{3}|n^{3}|+\frac{1}{2}|n^{3}|+\frac{1}{6}|n^{3}|\\
+ &=&|n^{3}|
+\end{eqnarray*}
+\end{document}