Almost Intersecting Families of Sets

Almost Intersecting Families of Sets
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几乎相交的集合族

DOI:
10.1137/120878744
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发表时间:
2012
影响因子:
0.8
通讯作者:
Vajk Szécsi
Vajk Szécsi
中科院分区:
数学3区
文献类型:
--
作者:
Dániel Gerbner;N. Lemons;C. Palmer;Balázs Patkós;Vajk Szécsi

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我们用${\mathcal D}_{{\mathcal F}}(G)=\{F \in {\mathcal F}:F\cap G=\emptyset\}$表示一个集合$G$和一个家庭${\mathcal F}$。那么一个集合族${\mathcal F}$被称为($\le l$)-几乎相交($l$ -几乎相交),如果对于任何$F \in {\mathcal F}$我们有$|{\mathcal D}_{{\mathcal F}}(F)| \le l$ ($|{\mathcal D}_{{\mathcal F}}(F)|= l$)。在本文中,我们研究了($\le l$)-几乎相交($l$ -几乎相交)族${\mathcal F}$的最大尺寸问题。
Let us write ${\mathcal D}_{{\mathcal F}}(G)=\{F \in {\mathcal F}:F\cap G=\emptyset\}$ for a set $G$ and a family ${\mathcal F}$. Then a family ${\mathcal F}$ of sets is said to be ($\le l$)-almost intersecting ($l$-almost intersecting) if for any $F \in {\mathcal F}$ we have $|{\mathcal D}_{{\mathcal F}}(F)| \le l$ ($|{\mathcal D}_{{\mathcal F}}(F)|= l$). In this paper we investigate the problem of finding the maximum size of an ($\le l$)-almost intersecting ($l$-almost intersecting) family ${\mathcal F}$.