Frequent elements in union-closed set families
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866913938630770688 |
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| author | Das, Shagnik Wu, Saintan |
| author_facet | Das, Shagnik Wu, Saintan |
| contents | The Union-Closed Sets Conjecture asks whether every union-closed set family $\mathcal{F}$ has an element contained in half of its sets. In 2022, Nagel posed a generalisation of this problem, suggesting that the $k$th-most popular element in a union-closed set family must be contained in at least $\frac{1}{2^{k-1} + 1} |\mathcal{F}|$ sets.
We combine the entropic method of Gilmer with the combinatorial arguments of Knill to show that this is indeed the case for all $k \ge 2$, and characterise the families that achieve equality. Furthermore, we show that when $|\mathcal{F}| \to \infty$, the $k$th-most frequent element will appear in at least $\left( \frac{3 - \sqrt{5}}{2} - o(1) \right) |\mathcal{F}|$ sets, reflecting the recent progress made for the Union-Closed Set Conjecture. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_03862 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Frequent elements in union-closed set families Das, Shagnik Wu, Saintan Combinatorics 05D05 The Union-Closed Sets Conjecture asks whether every union-closed set family $\mathcal{F}$ has an element contained in half of its sets. In 2022, Nagel posed a generalisation of this problem, suggesting that the $k$th-most popular element in a union-closed set family must be contained in at least $\frac{1}{2^{k-1} + 1} |\mathcal{F}|$ sets. We combine the entropic method of Gilmer with the combinatorial arguments of Knill to show that this is indeed the case for all $k \ge 2$, and characterise the families that achieve equality. Furthermore, we show that when $|\mathcal{F}| \to \infty$, the $k$th-most frequent element will appear in at least $\left( \frac{3 - \sqrt{5}}{2} - o(1) \right) |\mathcal{F}|$ sets, reflecting the recent progress made for the Union-Closed Set Conjecture. |
| title | Frequent elements in union-closed set families |
| topic | Combinatorics 05D05 |
| url | https://arxiv.org/abs/2412.03862 |