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完备布尔代数的Scott空间未必是余可定义的(co-sober)

School of Mathematics and Statistics, Guilin University of Technology, Guilin 541004, ChinaScott spaces of complete Boolean algebras need not be co-sober

Wei Ji, Xiaoquan Xu

arXiv 2608.08484首次发表:更新:

AI 中文总结

本文通过构造嵌入与实例,证明完备布尔代数的Scott空间未必是co-sober的,否定了相关公开问题,同时验证了对应空间的非可定义性与良滤性。

AI 中文摘要

本文首先证明,对于完备布尔代数$L$,$L$的补图是一个KC-空间(作为子空间),且该图的每个非单点紧不可约子空间都会在平方代数$L\times L$的Scott空间中生成一个非主k-不可约紧饱和集。随后我们证明,每个紧序列US-空间都可以嵌入到某个合适的完备布尔代数的补图中;该嵌入由有限尾约束偏序集及其正则开完备化构造而成。将此构造应用于van Douwen的紧Fréchet反Hausdorff US-空间,得到一个完备布尔代数$B$,其Scott空间$ΣB$不是余可定义的(co-sober),从而否定地回答了关于完备布尔代数Scott空间的一个问题。该Scott空间$ΣB$同时也是非可定义的(non-sober),并且作为完备格的Scott空间,它是良滤过的(well-filtered)。

英文摘要

In this paper, we first prove that for a complete Boolean algebra $L$, the complement graph of $L$ is a \emph{KC}-space (as a subspace) and each non-singleton compact irreducible subspace of that graph generates a non-principal $k$-irreducible compact saturated set in the Scott space of the square algebra $L\times L$. We then show that every compact sequential \emph{US}-space embeds into the complement graph of a suitable complete Boolean algebra. The embedding is built from a finite tail-constraint poset and its regular-open completion. Applying the construction to van Douwen's compact Fréchet anti-Hausdorff \emph{US}-space gives a complete Boolean algebra $B$ whose Scott space $Σ~\!\!B$ is not co-sober, thereby answering negatively a question on Scott spaces of complete Boolean algebras. The same Scott space $Σ~\!\!B$ is non-sober and, as a Scott space of a complete lattice, is well-filtered.

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