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-\newpage\section{Chvatal}
-%<–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––>
-\begin{NewMacroBox}{grChvatal}{\oarg{options}}
-
-\medskip
-From Wikipedia : \url{http://en.wikipedia.org/wiki/Václav_Chvátal}
-
-\emph{Chvátal first learned of graph theory in 1964, on finding a book by Claude Berge in a Pilsen bookstore, and his first mathematical publication, at the age of 19, concerned directed graphs that cannot be mapped to themselves by any nontrivial graph homomorphism.\hfill\break
-Gallery Theorem—which determines the number of guards required to survey the
-walls of a polygonal art gallery (and has prompted much research), and constructed the smallest triangle-free 4-chromatic 4-regular graph, a beautiful graph now known as the Chvatal graph.}
-
-
-\medskip
-From MathWord : \url{http://mathworld.wolfram.com/ChvatalGraph.html}
-
-\emph{The Chvátal graph is a quartic graph on 12 nodes and 24 edges. It has chromatic number 4, and girth 4.}
-\href{http://mathworld.wolfram.com/topics/GraphTheory.html}%
- {\textcolor{blue}{MathWorld}} by \href{http://en.wikipedia.org/wiki/Eric_W._Weisstein}%
- {\textcolor{blue}{E.Weisstein}}
-
-\medskip
-The Chvátal graph is implemented in \tkzname{tkz-berge} as \tkzcname{grChvatal} with three forms.
-\end{NewMacroBox}
-
-\medskip
-\subsection{\tkzname{Chvatal graph I}}
-
-\bigskip
-
-\begin{center}
- \begin{tkzexample}[vbox]
- \begin{tikzpicture}[scale=.7]
- \GraphInit[vstyle=Shade]
- \SetVertexNoLabel
- \SetGraphShadeColor{blue!50!black}{blue}{gray}
- \grChvatal[RA=6,RB=2]
- \end{tikzpicture}
- \end{tkzexample}
-
-\end{center}
-
-\vfill\newpage
-\subsection{\tkzname{Chvatal graph II}}
-
-\bigskip
-\begin{center}
- \begin{tkzexample}[vbox]
- \begin{tikzpicture}
- \GraphInit[vstyle=Art]
- \SetGraphArtColor{blue!50!black}{gray}
- \grChvatal[form=2,RA=7,RB=4,RC=1.4]
- \end{tikzpicture}
- \end{tkzexample}
-
-\end{center}
-
-
-\vfill\newpage
-\subsection{\tkzname{Chvatal graph III}}
-
-\bigskip
-\begin{center}
- \begin{tkzexample}[vbox]
- \begin{tikzpicture}
- \GraphInit[vstyle=Art]
- \SetGraphArtColor{blue!50!black}{gray}
- \grChvatal[form=3,RA=7]
- \end{tikzpicture}
- \end{tkzexample}
-
-\end{center}
-
-\endinput \ No newline at end of file