A refinement of Ramsey theorem(Ramsey定理的一种推广)
Ramsey定理指出:对于任何一个正整数k,存在一个最小的正整数r(k,k),使得对任意一个至少有r(k,k)个顶点的图G,它或者有k个顶点的完全子图Kk,或者有k个顶点是独立集.由此定理易得:设G是顶点数n>r(k,k)的简单图,其边数e>0,且G的所有k阶导出子图的边数相等,那么G是完全图.并给出上述结论的推广:设G是n(n≥4)阶简单图,其边数e>0,对某个给定的自然数k(2≤k≤n-2),若G的所有k阶导出子图的边数相等,则G是完全图....
| Published in: | Zhejiang Daxue xuebao. Lixue ban |
|---|---|
| Main Authors: | XUKang-hua(许康华), HUANGQing-xue(黄庆学) |
| Format: | Article |
| Language: | Chinese |
| Published: |
Zhejiang University Press
2002-11-01
|
| Subjects: | |
| Online Access: | https://doi.org/zjup/1008-9497.2002.29.6.607-609 |
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