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<p>(also called arcs, links, or lines). A distinction is made between undirected graphs, where edges link two vertices symmetrically, and <a href="page.php?w=directed_graph">directed graph</a>s, where edges link two vertices asymmetrically. Graphs are one of the principal objects of study in <a href="page.php?w=discrete_mathematics">discrete mathematics</a>.</p>

<p><big> Definition and etymology </big></p>
<p>Graph theory is a branch of mathematics that studies <a href="page.php?w=Graph_%28discrete_mathematics%29">graph</a>s, mathematical structures for</p><p>
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