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22 lines
603 B
TeX
22 lines
603 B
TeX
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\documentclass[varwidth=true, border=2pt]{standalone}
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\usepackage{tikz}
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\usetikzlibrary{arrows,positioning}
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\tikzset{
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%Define standard arrow tip
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>=stealth',
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% Define arrow style
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pil/.style={->,thick}
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}
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\begin{document}
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\begin{tikzpicture}
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\node (a)[vertex] at (0,8) {$a$};
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\node (b)[vertex] at (0,4) {$b$};
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\node (c)[vertex] at (0,0) {$c$};
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\node (d)[vertex] at (4,4) {$d$};
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\foreach \from/\to/\pos in {a/b/20,a/b/-20,a/d/0,b/c/20,b/c/-20,b/d/0,c/d/0}
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\draw[line width=2pt] (\from) to [bend left=\pos] (\to);
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\end{tikzpicture}
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\end{document}
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