Counting spanning trees in self-similar networks by evaluating determinants

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Original languageEnglish
Article number113303
Journal / PublicationJournal of Mathematical Physics
Volume52
Issue number11
Publication statusPublished - 1 Nov 2011

Abstract

Spanning trees are relevant to various aspects of networks. Generally, the number of spanning trees in a network can be obtained by computing a related determinant of the Laplacian matrix of the network. However, for a large generic network, evaluating the relevant determinant is computationally intractable. In this paper, we develop a fairly generic technique for computing determinants corresponding to self-similar networks, thereby providing a method to determine the numbers of spanning trees in networks exhibiting self-similarity. We describe the computation process with a family of networks, called (x, y)-flowers, which display rich behavior as observed in a large variety of real systems. The enumeration of spanning trees is based on the relationship between the determinants of submatrices of the Laplacian matrix corresponding to the (x, y)-flowers at different generations and is devoid of the direct laborious computation of determinants. Using the proposed method, we derive analytically the exact number of spanning trees in the (x, y)-flowers, on the basis of which we also obtain the entropies of the spanning trees in these networks. Moreover, to illustrate the universality of our technique, we apply it to some other self-similar networks with distinct degree distributions, and obtain explicit solutions to the numbers of spanning trees and their entropies. Finally, we compare our results for networks with the same average degree but different structural properties, such as degree distribution and fractal dimension, and uncover the effect of these topological features on the number of spanning trees. © 2011 American Institute of Physics.

Citation Format(s)

Counting spanning trees in self-similar networks by evaluating determinants. / Lin, Yuan; Wu, Bin; Zhang, Zhongzhi et al.
In: Journal of Mathematical Physics, Vol. 52, No. 11, 113303, 01.11.2011.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review