Ramsey-Turán theory for partially-ordered sets
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arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866911733568765952 |
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| author | Katona, Gyula O. H. Mao, Yaping |
| author_facet | Katona, Gyula O. H. Mao, Yaping |
| contents | We introduce weak and strong poset Ramsey-Turán numbers for $t$-chains in host poset families, focusing on the Boolean lattice family $\mathcal{B}=\{B_n:n\ge 1\}$. For any poset $P$, we show $\operatorname{RT}(\mathcal{B};n,P,l,t)\le \operatorname{RT}^{\sharp}(\mathcal{B};n,P,l,t)$, with equality when $P$ is a chain. In particular, for $t=1$, $\operatorname{RT}(\mathcal{B};n,C_k,l)=\operatorname{RT}^{\sharp}(\mathcal{B};n,C_k,l)=(k-1)(l-1)$. We also give universal upper bounds for both versions. For fixed $k,l,t$ with $\min\{l-1,k-1\}\ge 1$, we prove $\operatorname{RT}^{\sharp}(\mathcal{B};n,A_k,l,t)=Θ(n^t)$. More generally, for every non-chain poset $P$, the strong number is $Θ(n^t)$ for fixed $l,t$. Finally, if $h(P)=r>t$ and $l(n)=\lfloor M_n^β\rfloor$ with $0<β\le α<1$, then both weak and strong versions admit lower bounds of order $Ω\!\left(2^{βn}n^{-β/2}\right)$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_31546 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ramsey-Turán theory for partially-ordered sets Katona, Gyula O. H. Mao, Yaping Combinatorics We introduce weak and strong poset Ramsey-Turán numbers for $t$-chains in host poset families, focusing on the Boolean lattice family $\mathcal{B}=\{B_n:n\ge 1\}$. For any poset $P$, we show $\operatorname{RT}(\mathcal{B};n,P,l,t)\le \operatorname{RT}^{\sharp}(\mathcal{B};n,P,l,t)$, with equality when $P$ is a chain. In particular, for $t=1$, $\operatorname{RT}(\mathcal{B};n,C_k,l)=\operatorname{RT}^{\sharp}(\mathcal{B};n,C_k,l)=(k-1)(l-1)$. We also give universal upper bounds for both versions. For fixed $k,l,t$ with $\min\{l-1,k-1\}\ge 1$, we prove $\operatorname{RT}^{\sharp}(\mathcal{B};n,A_k,l,t)=Θ(n^t)$. More generally, for every non-chain poset $P$, the strong number is $Θ(n^t)$ for fixed $l,t$. Finally, if $h(P)=r>t$ and $l(n)=\lfloor M_n^β\rfloor$ with $0<β\le α<1$, then both weak and strong versions admit lower bounds of order $Ω\!\left(2^{βn}n^{-β/2}\right)$. |
| title | Ramsey-Turán theory for partially-ordered sets |
| topic | Combinatorics |
| url | https://arxiv.org/abs/2605.31546 |