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<p>More than one century after Euler's paper on the bridges of <a href="page.php?w=K%C3%B6nigsberg">Königsberg</a>, and while <a href="page.php?w=Johann_Benedict_Listing">Johann Benedict Listing</a> was introducing the concept of topology, <a href="page.php?w=Arthur_Cayley">Arthur Cayley</a> was led by an interest in particular analytical forms arising from <a href="page.php?w=differential_calculus">differential calculus</a> to study a particular class of graphs, the <a href="page.php?w=tree_%28graph_theory%29">tree</a>s. This study had many implications</p><p>
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