Hierarchical Organization in Complex Networks

Details Hierarchical Organization in Complex Networks Hierarchical Organization in Complex Networks

2002-06-09

arxiv.org/abs/cond-mat/0206130v2

Phys. Rev. E 67, 026112 (2003)

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevE.67.026112

Many real networks in nature and society share two generic properties: they are scale-free and they display a high degree of clustering. We show that these two features are the consequence of a hierarchical organization, implying that small groups of nodes organize in a hierarchical manner into increasingly large groups, while maintaining a scale-free topology. In hierarchical networks the degree of clustering characterizing the different groups follows a strict scaling law, which can be used to identify the presence of a hierarchical organization in real networks. We find that several real networks, such as the World Wide Web, actor network, the Internet at the domain level and the semantic web obey this scaling law, indicating that hierarchy is a fundamental characteristic of many complex systems.

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