Thresholds and expectation thresholds for larger p

Fuente: arXiv
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Main Authors: Przybyłowski, Tomasz, Riordan, Oliver
Format: Preprint
Published: 2023
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author Przybyłowski, Tomasz
Riordan, Oliver
author_facet Przybyłowski, Tomasz
Riordan, Oliver
contents 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.
format Preprint
id arxiv_https___arxiv_org_abs_2302_03327
institution arXiv
publishDate 2023
record_format arxiv
spellingShingle Thresholds and expectation thresholds for larger p
Przybyłowski, Tomasz
Riordan, Oliver
Combinatorics
Probability
60C05
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.
title Thresholds and expectation thresholds for larger p
topic Combinatorics
Probability
60C05
url https://arxiv.org/abs/2302.03327