中国科学技术大学学报 ›› 2020, Vol. 50 ›› Issue (3): 289-293.DOI: 10.3969/j.issn.0253-2778.2020.03.005

• 论著 • 上一篇    下一篇

关于2-中心蜘蛛树的Erdo″s-So′s猜想

王仕成,侯新民   

  1. 中国科学技术大学数学科学学院,安徽合肥 230026
  • 收稿日期:2019-05-22 修回日期:2019-05-28 接受日期:2019-05-28 出版日期:2020-03-31 发布日期:2019-05-28

The Erdo″s-So′s conjecture for 2-center spiders

  1. WANG Shicheng, HOU Xinmin
  • Received:2019-05-22 Revised:2019-05-28 Accepted:2019-05-28 Online:2020-03-31 Published:2019-05-28
  • Contact: HOU Xinmin
  • About author:WANG Shicheng, male, Master candidate. Research field: Combinatorial graph theory. E-mail: wsc20161@mail.ustc.edu.cn

摘要: Erdo″s-So′s 猜想:如果图G平均度大于k-2,则G包含任一k个顶点的数. 蜘蛛树是指最多只有一个点度超过2的树. 范更华、洪艳梅和刘清海证明了该猜想对所有蜘蛛树成立. 本文我们定义2中心蜘蛛树为至多两个相邻点度超过2的树并且证明了 Erdo″s-So′s 猜想对腿长至多为2的2中心蜘蛛树都成立.

关键词: Erdo″s-So′s猜想, 树, 蜘蛛树, 2-中心蜘蛛树

Abstract: The Erdo″s-So′s Conjecture states that if G is a graph with average degree more than k-2, then G contains every tree on k vertices. A spider can be seen as a tree with at most one vertex of degree more than two. Fan, Hong, and Liu proved that the conjecture holds for spiders.

Key words: Erdo″s-So′s conjecture, tree, spider, 2-center spider

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