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Chainability and Hemmingsen's theorem

机译:易用性和汉明翰定理

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摘要

On the surface, the definitions of Chainability and Lebesgue covering dimension ≤ 1 are quite similar as covering properties. Using the ultracoproduct construction for compact Hausdorff spaces, we explore the assertion that the similarity is only skin deep. In the case of dimension, there is a theorem of E. Hemmingsen that gives us a first-order lattice-theoretic characterization. We show that no such characterization is possible for Chainability, by proving that if κ is any infinite cardinal and A is a lattice base for a nondegenerate continuum, then A is elementarily equivalent to a lattice base for a continuum Y, of weight κ, such that Y has a 3-set open cover admitting no chain open refinement.
机译:在表面上,可连接性和Lebesgue覆盖尺寸≤1的定义与覆盖属性非常相似。使用用于紧凑型Hausdorff空间的ultracoproduct结构,我们探索相似性仅存在于皮肤深处的断言。在维数的情况下,有一个E. Hemmingsen定理,它给我们提供了一阶晶格理论的表征。我们通过证明如果κ是无限基数并且A是非简并连续体的晶格基数,则A基本上等于权重κ的连续体Y的晶格基数,从而证明可链性没有这样的表征, Y具有3套开放式封面,不允许进行链式开放式优化。

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