Fig. 2.1. Graphical representation of a undirected (a), a directed (b), and a weighted undirected (c) graph with N = 7 nodes and K = 14 links. In the directed graph, adjacent nodes are connected by arrows, indicating the direction of each link. In the weighted graph, the values wi,j reported on each link indicate the weights of the links, and are graphically represented by the link thicknesses.
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