Graph theory isn’t enough. The mathematical language for talking about connections, which usually depends on networks — vertices (dots) and edges (lines connecting them) — has been an invaluable way ...

An ebook used to be available, but I could not easily locate it on the Web. Please do not make a mistake by ordering the book "Graph Theory With Applications" by the same authors. Also, be aware that ...

More by Gary Stix This article was originally published with the title “Graph Theory and Teatime” in Scientific American Magazine Vol. 296 No. 3 (March 2007) ...

The field of graph theory has been around since 1736, when Leonhard Euler published an article on the subject of the Seven Bridges of Königsberg (in Prussia, today’s Kaliningrad in Russia).