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author:

Fan, Genghua (Fan, Genghua.) [1] (Scholars:范更华) | Li, Yan (Li, Yan.) [2] | Song, Ning (Song, Ning.) [3] | Yang, Daqing (Yang, Daqing.) [4]

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Abstract:

The maximum average degree of a graph G, denoted by mad(G), is defined as mad(G) = max(H subset of G) 2e(H)/upsilon(H) . Suppose that a is an orientation of G, G(sigma) denotes the oriented graph. It is well-known that for any graph G, there exists an orientation sigma such that Delta(+) (G(sigma)) <= k if and only if mad(G) <= 2k. A graph is called a pseudoforest if it contains at most one cycle in each component, is d-bounded if it has maximum degree at most d. In this paper, it is proven that, for any non-negative integers k and d, if G is a graph with mad(G) <= 2k + 2d/k+d+1, then G decomposes into k + 1 pseudoforests with one being d-bounded. This result in some sense is analogous to the Nine Dragon Tree (NDT) Conjecture, which is a refinement of the famous Nash-Williams Theorem that characterizes the decomposition of a graph into forests. A class of examples is also presented to show the sharpness of our result. (C) 2015 Elsevier Inc. All rights reserved.

Keyword:

Decomposition of graphs Maximum average degree of a graph Maximum outdegree of an oriented graph Nine Dragon Tree Conjecture Pseudoforest

Community:

  • [ 1 ] [Fan, Genghua]Fuzhou Univ, Ctr Discrete Math, Fuzhou 350003, Fujian, Peoples R China
  • [ 2 ] [Li, Yan]Fuzhou Univ, Ctr Discrete Math, Fuzhou 350003, Fujian, Peoples R China
  • [ 3 ] [Song, Ning]Fuzhou Univ, Ctr Discrete Math, Fuzhou 350003, Fujian, Peoples R China
  • [ 4 ] [Yang, Daqing]Fuzhou Univ, Ctr Discrete Math, Fuzhou 350003, Fujian, Peoples R China

Reprint 's Address:

  • 杨大庆

    [Yang, Daqing]Fuzhou Univ, Ctr Discrete Math, Fuzhou 350003, Fujian, Peoples R China

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Source :

JOURNAL OF COMBINATORIAL THEORY SERIES B

ISSN: 0095-8956

Year: 2015

Volume: 115

Page: 72-95

1 . 0 9 4

JCR@2015

1 . 2 0 0

JCR@2023

ESI Discipline: MATHEMATICS;

ESI HC Threshold:86

JCR Journal Grade:1

CAS Journal Grade:2

Cited Count:

WoS CC Cited Count: 0

SCOPUS Cited Count: 10

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 0

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