Thresholds and expectation thresholds for larger p
Abstract
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.
- Publication:
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arXiv e-prints
- Pub Date:
- February 2023
- DOI:
- arXiv:
- arXiv:2302.03327
- Bibcode:
- 2023arXiv230203327P
- Keywords:
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- Mathematics - Combinatorics;
- Mathematics - Probability;
- 60C05
- E-Print:
- 5 pages