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sagemath
GitHub Repository: sagemath/sage
 Path: blob/develop/src/doc/en/reference/combinat/media/day-doubling.tex
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\documentclass{standalone}

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\usepackage{tikz}

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\usetikzlibrary{positioning}

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\usepackage{subfigure}

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\begin{document}

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\minipage{6cm}

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\begin{figure}

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\subfigure{

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\begin{tikzpicture}

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  \node (A) {$\circ$};

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  \node (U) [above of=A] {a};

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  \node (U1) [above left of=U] {b};

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  \node (U2) [above right of=U] {c};

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  \node (B) [above right of=U1] {$\circ$};

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  \draw [gray, dashed] (A) -- (U);

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  \draw [line width=0.5mm, red] (U) -- (U1);

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  \draw [line width=0.5mm, red] (U) -- (U2);

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  \draw [gray, dashed] (U1) -- (B);

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  \draw [gray, dashed] (U2) -- (B);

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\end{tikzpicture}

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}

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\subfigure{

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\begin{tikzpicture}

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  \node (A) {$\circ$};

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  \node (U) [above of=A] {a};

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  \node (U1) [above left of=U] {b};

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  \node (U2) [above right of=U] {c};

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  \node (V) [right of=U2] {a'};

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  \node (V1) [above left of=V] {b'};

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  \node (V2) [above right of=V] {c'};

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  \node (B) [above right of=V1] {$\circ$};

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  \draw [gray, dashed] (A) -- (U);

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  \draw [line width=0.5mm, red] (U) -- (U1);

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  \draw [line width=0.5mm, red] (U) -- (U2);

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  \draw (U) -- (V);

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  \draw (U1) -- (V1);

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  \draw (U2) -- (V2);

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  \draw [line width=0.5mm, red] (V) -- (V1);

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  \draw [line width=0.5mm, red] (V) -- (V2);

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  \draw [gray, dashed] (V1) -- (B);

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  \draw [gray, dashed] (V2) -- (B);

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\end{tikzpicture}

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}

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\end{figure}

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\endminipage

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\end{document}

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