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arXiv 2302.03327math.COmath.PR
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阈值和期望阈值用于较大的p

Thresholds and expectation thresholds for larger p

University of Oxford(牛津大学)

Tomasz Przybyłowski, Oliver Riordan

AI总结:

该研究通过克隆族方法改进了Kahn-Kalai猜想,证明了阈值与期望阈值之间的关系。

摘要:

设$ p_\mathrm{c} $和$ q_\mathrm{c} $分别为有限集$ X $的递增族$ \mathcal{F} $的阈值和期望阈值,$ l $为$ \mathcal{F} $中最大的最小元素的大小。最近,Park和Pham证明了Kahn-Kalai猜想,该猜想指出$ p_\mathrm{c} \leqslant K q_\mathrm{c} \log_2 l $,其中$ K $为某个通用常数。在此,我们稍作加强,通过将适当的'克隆'族$ \mathcal{F}_k $应用于Park-Pham定理,将一般情况(包括相关结果)简化为个体元素概率$ p $较小的情况,从而证明$ p_\mathrm{c} \leqslant 1 - \mathrm{e}^{-K q_\mathrm{c} \log_2 l} $。

英文摘要:

Let $p_\mathrm{c}$ and $q_\mathrm{c}$ be the threshold and the expectation threshold, respectively, of an increasing family $\mathcal{F}$ of subsets of a finite set $X$, and let $l$ be the size of a largest minimal element of $\mathcal{F}$. Recently, Park and Pham proved the Kahn-Kalai conjecture, which says that $p_\mathrm{c} \leqslant K q_\mathrm{c} \log_2 l$ for some universal constant $K$. Here we slightly strengthen their result by showing that $p_\mathrm{c} \leqslant 1 - \mathrm{e}^{-K q_\mathrm{c} \log_2 l}$. The idea is to apply the Park-Pham Theorem to an appropriate `cloned' family $\mathcal{F}_k$, reducing the general case (of this and related results) to the case where the individual element probability $p$ is small.

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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