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
中科院分区:
文献类型:
--
作者:
Dániel Gerbner;N. Lemons;C. Palmer;Balázs Patkós;Vajk Szécsi
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 ${\mathcal F}$.