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arXiv 1808.09088math.LO
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$F_\sigma$ 理想的无限博弈与Ramsey性质

Infinite Games and Ramsey Properties of $F_σ$ Ideals

José de Jesús Pelayo Gómez

AI总结:

本文研究可数集合上Borel理想的组合性质,构造了满足特定博弈和Ramsey性质的高$F_\sigma$及$F_{\sigma\delta}$理想,回答了Zapletal和Hrušák的问题,并推广了Ramsey性质的刻画。

摘要:

我们研究可数集合上Borel理想的组合性质。我们构造了一个高的$F_\sigma$理想,使得玩家II在剪切-选择博弈中拥有必胜策略,回答了J. Zapletal的一个问题。我们还将随机图理想对Ramsey性质的刻画推广到与有限子集的随机着色相关的理想。扩展Hrušák、Meza-Alcántara、Thümmel和Uzcátegui的构造,我们为每个$m\in\omega$获得一个高的$F_\sigma$理想$\mathcal{ED}_m$,满足$\omega\to(\mathcal{ED}_m^+)^2_{m+1}$但不满足$\omega\to(\mathcal{ED}_m^+)^2_{m+2}$。我们还构造了一个扩展Solecki理想的高$F_{\sigma\delta}$理想$\mathcal S_\omega$,满足$\mathcal S_\omega^+\to(\omega,\mathcal S_\omega^+)^2_2$但不满足$\mathcal S_\omega^+\not\to(\mathcal S_\omega^+)^2_2$,并推导出Solecki理想的一个Ramsey型性质。最后,我们构造了一个高的$F_\sigma$ $K$-一致理想,它不与$\mathcal{ED}_{\mathrm{fin}}$ Katětov等价,回答了M. Hrušák的一个问题。

英文摘要:

We study combinatorial properties of Borel ideals on countable sets. We construct a tall $F_σ$ ideal for which player II has a winning strategy in the cut-and-choose game, answering a question of J. Zapletal. We also generalize the characterization of Ramsey properties by the random graph ideal to ideals associated with random colorings of finite subsets. Extending a construction of Hrušák, Meza-Alcántara, Thümmel, and Uzcátegui, we obtain, for each $m\inω$, a tall $F_σ$ ideal $\mathcal{ED}_m$ satisfying $ω\to(\mathcal{ED}_m^+)^2_{m+1}$ but not $ω\to(\mathcal{ED}_m^+)^2_{m+2}$. We also construct a tall $F_{σδ}$ ideal $\mathcal S_ω$ extending the Solecki ideal, with $\mathcal S_ω^+\to(ω,\mathcal S_ω^+)^2_2$ but $\mathcal S_ω^+\not\to(\mathcal S_ω^+)^2_2$, and derive a Ramsey-type property of the Solecki ideal. Finally, we construct a tall $F_σ$ $K$-uniform ideal that is not Katětov-equivalent to $\mathcal{ED}_{\mathrm{fin}}$, answering a question of M. Hrušák.

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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