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+%%
+%% Ein Beispiel der DANTE-Edition
+%%
+%% 1. Auflage
+%%
+%% Beispiel 09-08-45 auf Seite 494.
+%%
+%% Copyright (C) 2011 Herbert Voss
+%%
+%% 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.
+%%
+%% See http://www.latex-project.org/lppl.txt for details.
+%%
+%%
+%% ====
+% Show page(s) 1
+%%
+%%
+\documentclass[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{352.81416pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+\usepackage{mathtools,esint} \newcommand*\diff{\mathop{}\!\mathrm{d}}
+\StopShownPreambleCommands
+\begin{document}
+\begin{align*}
+\iiint\limits_Rf(x,y,z)\diff R
+ &=\int\limits_{z_1}^{z_2}
+ \int\limits_{\varphi_1(z)}^{\varphi_2(z)}
+ \int\limits_{r_1(\varphi,z)}^{r_2(\varphi,z)}
+ F(r,\varphi,z)r\diff r\diff\varphi\diff z\\
+%\ArrowBetweenLines[\Downarrow]% linke Seite
+\ArrowBetweenLines* % rechte Seite (\Updownarrow ist der Standard)
+ &= \int\limits_{\varphi_1(z)}^{\varphi_2(z)}
+ \int\limits_{\vartheta_1(\varphi)}^{\vartheta_2(\varphi)}
+ \int\limits_{r_1(\vartheta,\varphi)}^{r_2(\vartheta,\varphi)}
+ F(r,\vartheta,\varphi)r^2\sin\vartheta\diff r\,r\diff\vartheta\diff\varphi
+\end{align*}
+\end{document}