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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1104.5401math.CO
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遗传性质的过饱和

Supersaturation for hereditary properties

David Saxton

摘要:

设$\mathcal{F}$是$r$ -一致超图的集合,设$0 < p < 1$ .已知存在$c = c(p,\mathcal{F})$使得$G(n,p)$中的随机$r$ -图不包含来自$\mathcal{F}$的导出子图的概率为$2^{(-c+o(1)){n \choose r}}$ .设$\mathcal{F}$中的每个图至少有$t$顶点。我们发现,事实上,对于每个$ε> 0$,存在$δ= δ(ε, p,\mathcal{F}) > 0$,这样的概率,一个随机的$r$ -图在$G(n,p)$包含少于$δn^t$诱导的子图,每个躺在$\mathcal{F}$是最多$2^{(-c+ε){n \choose r}}$。这一说法是一个类似的遗传性质的过饱和定理的Erdos和Simonovits。在我们的应用程序中,我们回答了Bollobás和Nikiforov的问题。

英文摘要:

Let $\mathcal{F}$ be a collection of $r$-uniform hypergraphs, and let $0 < p < 1$. It is known that there exists $c = c(p,\mathcal{F})$ such that the probability of a random $r$-graph in $G(n,p)$ not containing an induced subgraph from $\mathcal{F}$ is $2^{(-c+o(1)){n \choose r}}$. Let each graph in $\mathcal{F}$ have at least $t$ vertices. We show that in fact for every $ε> 0$, there exists $δ= δ(ε, p,\mathcal{F}) > 0$ such that the probability of a random $r$-graph in $G(n,p)$ containing less than $δn^t$ induced subgraphs each lying in $\mathcal{F}$ is at most $2^{(-c+ε){n \choose r}}$. This statement is an analogue for hereditary properties of the supersaturation theorem of Erdős and Simonovits. In our applications we answer a question of Bollobás and Nikiforov.

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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