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arXiv 1504.02243math.CO
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稀疏超图的生成结构与普适性

Spanning structures and universality in sparse hypergraphs

Olaf Parczyk, Yury Person

摘要:

本文研究了随机超图中各种生成结构的求法问题。我们注意到Riordan [生成子图of random graphs,Combinatorics,Probability & Computing 9(2000),no.2,125-148]的一般结果可以从随机图适用于随机$r$ -一致超图,并且当随机$r$ -一致超图$\mathcal{H}^{(r)}(n,p)$包含给定的生成结构a.a.s.我们还讨论了超图中的几种生成结构,如立方超图、格、球和Hamilton圈。此外,我们还研究了普适性问题,即当一个$r$ -一致超图包含任意一个以$Δ$为界且最大度在$n$上的超图时,它的普适性问题.对于$\mathcal{H}^{(r)}(n,p)$,表明这适用于$p= ω\left((\ln n/n)^{1/Δ}\right)$ a.a. s。通过组合Dellamonica、Kohayakawa、Rödl和Rucienski [An improved上界on density of universal random graphs,Random Structures Algorithms 46(2015),no. 2,274-299]以及Ferber、Nenadov和Peter [Universality of random graphs and rainbow embedding,Random Structures Algorithms,to appear]所采用的方法。此外,它表明,随机图$G(n,p)$适当的$p$和显式构造的泛图,由于Alon,Capalbo,Kohayakawa,Rödl,Rucibrski和Szemerédi和Alon和Capalbo产量的泛超图的构造是稀疏的随机超图$\mathcal{H}^{(r)}(n,p)$与$p= ω\left((\ln n/n)^{1/Δ}\right)$。

英文摘要:

In this paper the problem of finding various spanning structures in random hypergraphs is studied. We notice that a general result of Riordan [Spanning subgraphs of random graphs, Combinatorics, Probability & Computing 9 (2000), no. 2, 125-148] can be adapted from random graphs to random $r$-uniform hypergaphs and provide sufficient conditions when a random $r$-uniform hypergraph $\mathcal{H}^{(r)}(n,p)$ contains a given spanning structure a.a.s. We also discuss several spanning structures such as cube-hypergraphs, lattices, spheres and Hamilton cycles in hypergraphs. Moreover, we study universality, i.e. when does an $r$-uniform hypergraph contain any hypergraph on $n$ vertices and with maximum vertex degree bounded by $Δ$? For $\mathcal{H}^{(r)}(n,p)$ it is shown that this holds for $p= ω\left((\ln n/n)^{1/Δ}\right)$ a.a.s. by combining approaches taken by Dellamonica, Kohayakawa, Rödl and Ruciński [An improved upper bound on the density of universal random graphs, Random Structures Algorithms 46 (2015), no. 2, 274-299] and of Ferber, Nenadov and Peter [Universality of random graphs and rainbow embedding, Random Structures Algorithms, to appear]. Furthermore it is shown that the random graph $G(n,p)$ for appropriate $p$ and explicit constructions of universal graphs due to Alon, Capalbo, Kohayakawa, Rödl, Ruciński and Szemerédi and Alon and Capalbo yield constructions of universal hypergraphs that are sparser than the random hypergraph $\mathcal{H}^{(r)}(n,p)$ with $p= ω\left((\ln n/n)^{1/Δ}\right)$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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