arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1203.6536math.COcs.DM
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计算Ramsey数$R(K_5-P_3,K_5)$

Computing the Ramsey Number $R(K_5-P_3,K_5)$

Jesse A. Calvert, Michael J. Schuster, Stanisław P. Radziszowski

摘要:

我们给出了一个计算机辅助证明的事实,$R(K_5-P_3, K_5)=25$。这解决了亨德利表中剩下的三个开放案例之一,该表列出了5个顶点上的图对的拉姆齐数。我们发现不存在包含23或24个顶点上的$K_4$的$(K_5-P_3,K_5)$ -好图,其中如果$F$不包含$G$且$F$的补图不包含$H$,则图$F$是$(G,H)$ -好图.给出了唯一的含有22个顶点的$K_4$的$(K_5-P_3,K_5)$ -好图.

英文摘要:

We give a computer-assisted proof of the fact that $R(K_5-P_3, K_5)=25$. This solves one of the three remaining open cases in Hendry's table, which listed the Ramsey numbers for pairs of graphs on 5 vertices. We find that there exist no $(K_5-P_3,K_5)$-good graphs containing a $K_4$ on 23 or 24 vertices, where a graph $F$ is $(G,H)$-good if $F$ does not contain $G$ and the complement of $F$ does not contain $H$. The unique $(K_5-P_3,K_5)$-good graph containing a $K_4$ on 22 vertices is presented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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