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author:

Fan, G. (Fan, G..) [1] | Li, Y. (Li, Y..) [2] | Song, N. (Song, N..) [3] | Yang, D. (Yang, D..) [4]

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Scopus

Abstract:

The maximum average degree of a graph G, denoted by mad(G), is defined as mad(G)=maxH⊆G2e(H)/v(H). Suppose that σ is an orientation of G, Gσ denotes the oriented graph. It is well-known that for any graph G, there exists an orientation σ such that Δ+(Gσ)≤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. © 2015 Elsevier Inc.

Keyword:

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

Community:

  • [ 1 ] [Fan, G.]Center for Discrete Mathematics, Fuzhou University, Fuzhou, Fujian, 350003, China
  • [ 2 ] [Li, Y.]Center for Discrete Mathematics, Fuzhou University, Fuzhou, Fujian, 350003, China
  • [ 3 ] [Song, N.]Center for Discrete Mathematics, Fuzhou University, Fuzhou, Fujian, 350003, China
  • [ 4 ] [Yang, D.]Center for Discrete Mathematics, Fuzhou University, Fuzhou, Fujian, 350003, 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 HC Threshold:86

JCR Journal Grade:1

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: 5

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