The number of hypergraphs without linear cycles

The number of hypergraphs without linear cycles
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没有线性循环的超图的数量

DOI:
10.1016/j.jctb.2018.07.003
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发表时间:
2017
期刊:
J. Comb. Theory B
影响因子:
--
通讯作者:
J. Skokan
J. Skokan
中科院分区:
--
文献类型:
--
作者:
J. Balogh;Bhargav P. Narayanan;J. Skokan

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r-一致线性k-圈C k r是在k(r− 1)个顶点上的r-一致超图,其边是在顶点集的循环排序中的r个连续顶点的集合,以这样的方式选择,即每对连续边恰好共享一个顶点。在这里,我们证明了线性圈的平衡过饱和结果,然后我们结合超图容器的方法来证明,对于任何固定的整数对r,k≥ 3,在n个顶点上无Ckr的r-一致超图的数量是2 Θ(nr − 1),从而解决了Mubayi和Wang在2017年提出的一个猜想。
The r-uniform linear k-cycle C k r is the r-uniform hypergraph on k (r− 1) vertices whose edges are sets of r consecutive vertices in a cyclic ordering of the vertex set chosen in such a way that every pair of consecutive edges share exactly one vertex. Here, we prove a balanced supersaturation result for linear cycles which we then use in conjunction with the method of hypergraph containers to show that for any fixed pair of integers r, k≥ 3, the number of C k r-free r-uniform hypergraphs on n vertices is 2 Θ (n r− 1), thereby settling a conjecture due to Mubayi and Wang from 2017.
DOI: 10.1002/jgt.22477
发表时间: 2017-09
影响因子: 0.9
作者:
J. Balogh;Lina Li
通讯作者: J. Balogh;Lina Li