数学物理学报

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对于轮和完全图的 Ramsey 数的渐近上界

宋洪雪;白路峰; 刘书彦   

  1. 南京邮电大学数理学院 南京 210003
  • 收稿日期:2004-03-21 修回日期:2005-12-28 出版日期:2006-10-25 发布日期:2006-10-25
  • 通讯作者: 宋洪雪
  • 基金资助:
    国家自然科学基金(19871023)和江苏省自然科学基金资助

Asymptotic Upper Bounds for Wheel: Complete Graph Ramsey Numbers

Song Hongxue ; Bai Lufeng; Liu Shuyan   

  1. College of Sciences, Nanjing University of Posts and Telecommunications, Nanjing 210003
  • Received:2004-03-21 Revised:2005-12-28 Online:2006-10-25 Published:2006-10-25
  • Contact: Song Hongxue

摘要:

该文给出:对于偶数m≥4当n→ ∞时
r(Wm,Kn)≤l(1+o(1))C1(m) (n/logn ) (2m-2)/(m-2)

对于奇数m≥5当n→∞时
r(Wm,Kn)≤
(1+o(1))C2(m) (n2m/m+1/log n)(m+1)/(m-1) .

特别地,C2(5)=12. 以及 c(n/logn)5/2≤r(K4,Kn)≤ (1+o(1)) n3/(logn)2.
此外,该文还讨论了轮和完全图的 Ramsey 数的一些推广.

关键词: Ramsey 数, 轮, 独立数, 完全图

Abstract: It is shown that r(Wm,Kn)≤l(1+o(1))C1(m) (n/logn ) (2m-2)/(m-2)
for fixed even
r(Wm,Kn)≤(1+o(1))C2(m) (n2m/m+1/log n)(m+1)/(m-1) for fixed odd m≥5 and n→∞. In particular, C2(5)=12 . Also, c(n/logn)5/2≤r(K4,Kn)≤ (1+o(1)) n3/(logn)2. Moreover, in this paper, the authors discuss some generalizations for wheel: complete graph Ramsey numbers.

Key words: Ramsey numbers, Wheels

中图分类号: 

  • 05C55