📚 The CoCalc Library - books, templates and other resources

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\tikzstyle{vertex}=[draw,black,circle,minimum size=10pt,inner sep=0pt]
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\tikzstyle{edge}=[very thick]
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\begin{tikzpicture}[scale=1,framed]
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    \node (a)[vertex,label=$A$] at (0,0) {$v_1$};
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    \node (b)[vertex,label=45:{\color{blue}$A$}] at (1,0) {$v_2$};
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    \node (c)[vertex,label=$B$] at (2,0) {$v_3$};
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    \node (d)[vertex] at (1,1) {$v_4$};
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    \draw[->] (b) -- (a);
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    \draw[->] (b) -- (c);
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    \draw[->] (d) -- (a);
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    \draw[->] (d) -- (b);
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    \draw[->] (d) -- (c);
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    \node (struktur)[label={[label distance=-0.2cm]0:$t=3$}] at (-1,1) {};
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\end{tikzpicture}
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