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%%  Example 07-06-1 
%%  Copyright (C) 2017 Herbert Voss
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\documentclass[]{exaarticle2}
\pagestyle{empty}
\setlength\textwidth{328.62788pt}
\setlength\parindent{0pt}
\usepackage[T1]{fontenc}
%StartShownPreambleCommands
\usepackage{amsmath}
\usepackage[partialup]{kpfonts}
\usepackage{esint}
\def\Q#1#2{\frac{\partialup #1}{\partialup #2}}
%StopShownPreambleCommands
\begin{document}
The \emph{first theorem of Green} is:
\[
\underset{\mathcal{G}\quad}\iiint\!%
	\left[u\nabla^{2}v+\left(\nabla u,\nabla v\right)\right]\mathrm{d}^{3}V
	=\underset{\mathcal{S}\quad}\oiint u\,\Q{v}{n}\,\,\mathrm{d}^{2}A
\]
The \emph{second theorem of Green} is:
\[
\underset{{\mathcal{G}\quad}}\iiint\!%
	\left[u\nabla^{2}v-v\nabla^{2}u\right]\mathrm{d}^{3}V
	=\underset{\mathcal{S}\quad}\oiint\left(u\,\Q{v}{n}-v\,\Q{u}{n}\right)\mathrm{d}^{2}A
\]
\end{document}
