Heawood graph

The smallest cubic graph of girth 6, or 6-cage, drawn with PS Tricks. This was inspired from the example in The LaTeX Graphics Companion, page 121.

\documentclass{article}\usepackage{pstricks,pst-node,multido,ifthen,calc}\pagestyle{empty}

\begin{document}\begin{center}\begin{pspicture}(-1,-1.5)(1,1.5) \psset{unit=1.5cm} \newcounter{CtA} \newcounter{Temp} \newcounter{Tempi} \SpecialCoor \degrees[14] \multido{\ia=0+1}{14}{% \setcounter{CtA}{\ia}% \addtocounter{CtA}{1}% \multido{\ib=\value{CtA}+1}{1}{\psline{o-o}(1;\ia)(1;\ib)} }% \multido{\ia=0+2}{7}{% \setcounter{CtA}{\ia}% \addtocounter{CtA}{5} \multido{\ib=\value{CtA}+1}{1}{\psline{o-o}(1;\ia)(1;\ib)} }% \multido{\i=1+1}{14}{\rput(1;\i){% \setcounter{Temp}{\i}% \ifthenelse{\isodd{\value{Temp}}}% {\setcounter{Tempi}{(\value{Temp}+1)/2}} {\setcounter{Tempi}{(\value{Temp})/2}} }%}\end{pspicture}\end{center}\end{document}

See also: Original Source by Rafael