Introduction to graph theory
6882 Citations•1973•
K. Fraughnaugh
The Mathematical Gazette
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Abstract
In graph theory, the term graph refers to a set of vertices and a set of edges. A vertex can be used to represent any object. Graphs may contain undirected or directed edges. An undirected edge is a set of two vertices. A directed edge is an ordered pair of two vertices where the edge goes from the first vertex to the second vertex. Graphs that contain directed edges are called directed graphs or digraphs.