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A bound for 1-cross intersecting set pair systems
European Journal of Combinatorics ( IF 1 ) Pub Date : 2021-04-27 , DOI: 10.1016/j.ejc.2021.103345 Ron Holzman
中文翻译:
1个交叉相交集对系统的界
更新日期:2021-04-28
European Journal of Combinatorics ( IF 1 ) Pub Date : 2021-04-27 , DOI: 10.1016/j.ejc.2021.103345 Ron Holzman
A well-known result of Bollobás says that if is a set pair system such that and for , and if and only if , then . Füredi, Gyárfás and Király recently initiated the study of such systems with the additional property that for all . Confirming a conjecture of theirs, we show that this extra condition allows an improvement of the upper bound (at least) by a constant factor.
中文翻译:
1个交叉相交集对系统的界
Bollobás的一个著名结果说,如果 是一个集合对系统,使得 和 为了 , 和 当且仅当 , 然后 。菲瑞迪(Füredi),贾尔法斯(Gyárfás)和基拉利(Király)最近开始研究此类系统,其附加特性 对所有人 。证实他们的猜想,我们证明了这种额外的条件允许(至少)以恒定因子提高上限。