Chapter 2 Graphs - Cornell University
GRAPHS B A C D (a) A graph on 4 nodes. B A C D (b) A directed graph on 4 nodes. Figure 2.1: Two graphs: (a) an undirected graph, and (b) a directed graph. will be undirected unless noted otherwise. Graphs as Models of Networks. Graphs are useful because they serve as mathematical models of network structures.
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