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arXiv 0901.1688math.COmath.LO
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块序列的余理想

Coideals of block sequences

José G. Mijares, Jesús Nieto

摘要:

本文将$\mathbb{N}$上的\textit{coideal}的概念推广到$FIN_k$上的块序列族,证明了如果块序列的共理想是\textit{semiselective},并且满足局部形式的Gowers定理\cite{Gow},则相对于它的局部Ramsey性质可以用抽象的Baire性质来刻画,并且在Suslin操作下,相对于一个这样的共理想具有本地Ramsey属性的所有集合的家族都是封闭的。我们还证明了这些余理想满足Taylor \cite{taylor},López-Abad \cite{jordi}和Blass \cite{blass}意义下的一类\emph{canonical partition property}.这个结果给了我们一个想法的条件,要考虑在一个抽象的研究局部拉姆齐财产的背景下,拓扑拉姆齐空间(见\cite{todo})。

英文摘要:

We extend the well known notion of \textit{coideal} on $\mathbb{N}$ to families of block sequences on $FIN_k$ and prove that if a coideal of block sequences is \textit{semiselective} and satisfies a local version of Gowers' theorem \cite{Gow} then the local Ramsey property relative to it can be characterized in terms of the abstract Baire property, and the family of all sets having the local Ramsey property relative to one such coideal is closed under the Suslin operation. We also prove that these coideals satisfy a sort of \emph{canonical partition property} in the sense of Taylor \cite{taylor}, López-Abad \cite{jordi} and Blass \cite{blass}. This results give us an idea of the conditions to be considered in an abstract study of the local Ramsey property in the context of topological Ramsey spaces (see \cite{todo}).

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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