arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.00317math.CO
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布尔立方Ramsey数的一种构造

A Construction for Boolean cube Ramsey numbers

Tom Bohman, Fei Peng

摘要:

令$Q_n$是由固定$n$ -元素集合的所有子集组成的偏序集,按集合包含排序。偏序集立方Ramsey数$R(Q_n,Q_n)$被定义为最小$m$使得$Q_m$的元素的任何2-着色允许$Q_n$的单色拷贝。Cox和Stolee改进了平凡下界$R(Q_n,Q_n)\ge 2n$,他们使用概率存在性证明证明了$3\le n\le 8$和$n\ge 13$的$R(Q_n,Q_n)\ge 2n+1$。在本文中,我们提供了一个明确的建设,建立$R(Q_n,Q_n)\ge 2n+1$的所有$n\ge 3$。最著名的上界是由Lu和Thompson提出的$ R(Q_n, Q_n) \le n^2 - 2n + 2$。

英文摘要:

Let $Q_n$ be the poset that consists of all subsets of a fixed $n$-element set, ordered by set inclusion. The poset cube Ramsey number $R(Q_n,Q_n)$ is defined as the least $m$ such that any 2-coloring of the elements of $Q_m$ admits a monochromatic copy of $Q_n$. The trivial lower bound $R(Q_n,Q_n)\ge 2n$ was improved by Cox and Stolee, who showed $R(Q_n,Q_n)\ge 2n+1$ for $3\le n\le 8$ and $n\ge 13$ using a probabilistic existence proof. In this paper, we provide an explicit construction that establishes $R(Q_n,Q_n)\ge 2n+1$ for all $n\ge 3$. The best known upper bound, due to Lu and Thompson, is $ R(Q_n, Q_n) \le n^2 - 2n + 2$.

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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