"graph of vertices" . . "A construct that consists of many nodes connected with edges. The edges represent a relationship between the objects represented by the nodes. A graph can be equivalently represented as a matrix." . . "Bjoern Peters" . "WEB: http://mitpress.mit.edu/books/FLAOH/cbnhtml/glossary-G.html" . "Chris Stoeckert" . . "James Malone" . "For example, if the nodes are cities, then the edges may have numerical values that correspond to the distances between the cities." . . "graph of vertices" .