Note 10.1 In drawing a graph, it is immaterial whether the lines joining vertices are drawn
straight or curved, long or short. The importance lies in the incidence between the edges and
vertices [Fig. 10.4(a)].
Multigraph: A graph that contains self-loops or parallel edges or both is called a multigraph.
The graph shown is Fig. 10.2 is one such graph.
10.2.2 Directed and Undirected Graph
A graph in which direction is associated with each edge is called a directed graph. A directed graph
is a one-way road where traffic flow is allowed only in one direction. A directed ...
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