Inmathematics,graph theory is the study ofgraphs, which are mathematical structures used to model pairwise relations between objects. A graph in this context is made up ofvertices, nodes, or points which are connected by edges, arcs, or lines.

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• InEuler’s investigation of thebridges of Königsberg, he discovered that it was the general arrangement of features that was important, not their exact locations. This observation led to the creation of graph theory, one of the earliest incarnations oftopology.
  • David S. Richeson (8 March 2012). Euler's Gem: The Polyhedron Formula and the Birth of Topology. Princeton University Press. pp. 156–157.ISBN 1-4008-3856-8. 

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