New bounds on the maximum size of Sperner partition systems
New bounds on the maximum size of Sperner partition systems
复制标题
Sperner 分区系统最大大小的新限制
DOI:
10.1016/j.ejc.2020.103165
复制
发表时间:
2020
影响因子:
1
通讯作者:
Zhou, Junling
中科院分区:
文献类型:
--
作者:
Chang, Yanxun;Colbourn, Charles J.;Gowty, Adam;Horsley, Daniel;Zhou, Junling
Abstract An (n, k)-Sperner partition system is a collection of partitions of some n-set, each into k nonempty classes, such that no class of any partition is a subset of a class of any other. The maximum number of partitions in an (n, k)-Sperner partition system is denoted SP (n, k). In this paper we introduce a new construction for Sperner partition systems and use it to asymptotically determine SP (n, k) in many cases as n k becomes large. We also give a slightly improved upper bound for SP (n, k) and exhibit an infinite family of parameter sets (n, k) for which this bound is tight.
DOI:
10.37236/1987
发表时间:
2005
期刊:
Electron. J. Comb.
影响因子:
--
作者:
Karen Meagher;Lucia Moura;B. Stevens
通讯作者:
B. Stevens
DOI:
10.1137/100808630
发表时间:
2010
期刊:
SIAM J. Discret. Math.
影响因子:
--
作者:
B. Bukh
通讯作者:
B. Bukh
DOI:
10.37236/5826
发表时间:
2016
期刊:
Electron. J. Comb.
影响因子:
--
作者:
D. Bryant
通讯作者:
D. Bryant