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author:

Fan, G. (Fan, G..) [1] | Sun, L. (Sun, L..) [2]

Indexed by:

Scopus

Abstract:

A classical result on extremal graph theory is the Erdös-Gallai theorem: if a graph on n vertices has more than frac((k - 1) n, 2) edges, then it contains a path of k edges. Motivated by the result, Erdös and Sós conjectured that under the same condition, the graph should contain every tree of k edges. A spider is a rooted tree in which each vertex has degree one or two, except for the root. A leg of a spider is a path from the root to a vertex of degree one. Thus, a path is a spider of 1 or 2 legs. From the motivation, it is natural to consider spiders of 3 legs. In this paper, we prove that if a graph on n vertices has more than frac((k - 1) n, 2) edges, then it contains every k-edge spider of 3 legs, and also, every k-edge spider with no leg of length more than 4, which strengthens a result of Woźniak on spiders of diameter at most 4. © 2007 Elsevier B.V. All rights reserved.

Keyword:

Erdös-Sós conjecture; Spiders; Trees

Community:

  • [ 1 ] [Fan, G.]Department of Mathematics, Fuzhou University, Fujian 350002, China
  • [ 2 ] [Sun, L.]Department of Maths and Informatics Sciences, College of Basic Sciences, Huazhong Agricultural University, Wuhan, 430070, China

Reprint 's Address:

  • [Fan, G.]Department of Mathematics, Fuzhou University, Fujian 350002, China

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Source :

Discrete Mathematics

ISSN: 0012-365X

Year: 2007

Issue: 23

Volume: 307

Page: 3055-3062

0 . 3 7 7

JCR@2007

0 . 7 0 0

JCR@2023

JCR Journal Grade:3

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 23

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 2

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