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\documentclass[a4paper,12pt]{report}
\usepackage{german,pstricks,pst-node,pst-tree}
\usepackage[latin1]{inputenc}
\begin{document}
\psset{unit=1cm}
\hbox{
\pspicture(0,0)(8,5)
\rput(1,2){\rnode{A}{Gleichung}}
\rput(4,0.5){\ovalnode{B}{sichtbar}}
\rput(6,3){\rnode{C}{Kreis}}
\rput(7,4.5){\rnode{D}{$x^2+y^2=r^2$}}
\ncline{->}{A}{D}
\ncarc{->}{C}{D} \Bput{\footnotesize Beziehung}
\ncarc{->}{D}{C}
\nccurve[angleA=240, angleB=90,linestyle=dotted]
{->}{C}{B}
\endpspicture\hfil
\pstree[treemode=R,levelsep=1cm,radius=2pt]
{\Tcircle{root}}
{ \pstree{\TC*}{ \Tr{A} \Tr{B} \Tr{C} }
\pstree{\TC*}
{ \pstree{\TC*}{\Tr{$A_1$} \Tr{$A_2$}}
\pstree{\TC*}{\Tr{$B_1$} \Tr{$B_2$}}
}
\pstree[treemode=D]{\TC}
{\TR{$x^2$} \TR{$y_a^2$} \TR{$\frac{1}{x+y}$}
}
}
}
\end{document}
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