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Francesca Fiorenzi 《Discrete Applied Mathematics》2011,159(17):2045-2049
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Improved bounds for acyclic chromatic index of planar graphs 总被引:1,自引:0,他引:1
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A discrete function f defined on Zn is said to be logconcave if for , , . A more restrictive notion is strong unimodality. Following Barndorff-Nielsen [O. Barndorff-Nielsen, Unimodality and exponential families, Commun. Statist. 1 (1973) 189-216] a discrete function is called strongly unimodal if there exists a convex function such that if . In this paper sufficient conditions that ensure the strong unimodality of a multivariate discrete distribution, are given. Examples of strongly unimodal multivariate discrete distributions are presented. 相似文献
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The clustering coefficient of a scale-free random graph 总被引:2,自引:0,他引:2
N. Eggemann S.D. Noble 《Discrete Applied Mathematics》2011,159(10):953-965