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Torus für Krümmungsbeispiel modifiziert (Danke Jérôme!); Hinweis auf …
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…weitere

Kongruenzsätze
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MartinThoma committed Feb 20, 2014
1 parent 308e9e1 commit 9033c1f
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1 change: 1 addition & 0 deletions documents/GeoTopo/Bildquellen.tex
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Expand Up @@ -28,4 +28,5 @@ \chapter*{Bildquellen\markboth{Bildquellen}{Bildquellen}}
\href{https://commons.wikimedia.org/wiki/File:Spherical_triangle_3d_opti.png}{\path{commons.wikimedia.org/wiki/File:Spherical_triangle_3d_opti.png}}
\item[Abb. \ref{fig:moebius-strip}] Möbiusband: \href{http://tex.stackexchange.com/users/2552/jake}{Jake},
\href{http://tex.stackexchange.com/a/118573/5645}{\path{tex.stackexchange.com/a/118573/5645}}
\item[Abb. \ref{fig:torus-gauss-kruemmung}] Krümmung des Torus: Martin Thoma und Jérôme Urhausen, Email vom 17.02.2014.
\end{itemize}
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4 changes: 4 additions & 0 deletions documents/GeoTopo/Kapitel4.tex
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Expand Up @@ -636,6 +636,10 @@ \section{Axiome für die euklidische Ebene}
$\Rightarrow \IWS(\triangle ABC) = \gamma + \alpha'' + \beta' = \pi$
\end{beweis}

Aus der Eigenschaft, dass die Innenwinkelsumme von Dreiecken in der euklidischen Ebene
gleich $\pi$ ist, folgen direkt die Kongruenzsätze SWW und WWS über den Kongruenzsatz
WSW.\xindex{Kongruenzsatz!SWW}

\section{Weitere Eigenschaften einer euklidischen Ebene}
\begin{satz}[Strahlensatz]
In ähnlichen Dreiecken sind Verhältnisse entsprechender Seiten gleich.
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12 changes: 6 additions & 6 deletions documents/GeoTopo/figures/torus-gauss-kruemmung.tex
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\draw (-2,.2) .. controls (-1.5,-0.3) and (-1,-0.5) .. (0,-.5) .. controls (1,-0.5) and (1.5,-0.3) .. (2,0.2);
\draw (-1.75,0) .. controls (-1.5,0.3) and (-1,0.5) .. (0,.5) .. controls (1,0.5) and (1.5,0.3) .. (1.75,0);

\draw[dashed] (0,-1.5) ellipse (0.5cm and 1cm);
\draw (0,-0.5) arc (-270:-90:0.5 and 1);
\draw[dashed] (2.65,0) ellipse (0.85 and 0.6);
\draw (3.5,0) arc (-360:-180:0.85 and 0.6);

\node (s1)[point,orange,label={[label distance=0mm]90:\color{orange}$s_1$}] at (0,-0.5) {};
\node (s2)[point,red,label={[label distance=0mm]120:\color{red}$s_2$}] at (-0.5,-1.4) {};
\node (s3)[point,green,label={[label distance=0mm]90:\color{green}$s_3$}] at (0,-2.5) {};
\node (s1)[point,orange,label={[label distance=0mm]\color{orange}$s_1$}] at (3.5,0) {};
\node (s2)[point,red,label={[label distance=0mm]\color{red}$s_2$}] at (2.8,0.6) {};
\node (s3)[point,green,label={[label distance=0mm]\color{green}$s_3$}] at (1.8,0) {};
\draw[red] (0,0.07) ellipse (3cm and 1.5cm);
\end{tikzpicture}
\end{tikzpicture}
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