Paper Info
Title
Maximum matchings in scale-free networks with identical degree distribution.
Abstract
The size and number of maximum matchings in a network have found a large variety of applications in many fields. As a ubiquitous property of diverse real systems, power-law degree distribution was shown to have a profound influence on size of maximum matchings in scale-free networks, where the size of maximum matchings is small and a perfect matching often does not exist. In this paper, we study analytically the maximum matchings in two scale-free networks with identical degree sequence, and show that the first network has no perfect matchings, while the second one has many. For the first network, we determine explicitly the size of maximum matchings, and provide an exact recursive solution for the number of maximum matchings. For the second one, we design an orientation and prove that it is Pfaffian, based on which we derive a closed-form expression for the number of perfect matchings. Moreover, we demonstrate that the entropy for perfect matchings is equal to that corresponding to the extended Sierpiski graph with the same average degree as both studied scale-free networks. Our results indicate that power-law degree distribution alone is not sufficient to characterize the size and number of maximum matchings in scale-free networks.
Year
DOI
Venue
2017
10.1016/j.tcs.2017.02.027
Theor. Comput. Sci.
Keywords
DocType
Volume
Maximum matching,Perfect matching,Pfaffian orientation,Scale-free network,Complex network
Journal
675
Issue
ISSN
Citations 
C
0304-3975
1
PageRank 
References 
Authors
0.35
20
2
Name
Order
Citations
PageRank
Huan Li1184.60
Zhongzhi Zhang28522.02