Scale-free graphs are characterized by a scale-free degree distribution P(k)

<p><b>Copyright information:</b></p><p>Taken from "Graph theoretical analysis of complex networks in the brain"</p><p>http://www.nonlinearbiomedphys.com/content/1/1/3</p><p>Nonlinear Biomedical Physics 2007;1():3-3.</p><p>Published online 5 Jul 2007</p><p>PMCID:PMC1976403.</p><p></p> In scale-free graphs, different vertices have very different degrees, and typically a few vertices with extremely high degrees (so-called 'hubs') are present. In the schematic example shown here the white (k = 9) and the striped (k = 7) vertices are examples of hubs