论紧凑有值可测函数空间的 Baire 特性

Alexander V. Osipov
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引用次数: 0

摘要

如果百里范畴定理对 $X$ 成立,即 $X$ 的任何开放致密子集序列的交集在 $X$ 中致密,则拓扑空间 $X$ 是百里的。函数空间理论中一个有趣的问题是通过函数支持的拓扑性质来描述函数空间的 Baire 性质。本文解决了定义在可测空间$(X,\Sigma)$上的所有可测紧凑值($K$值)函数的空间$M(X,K)$的这一问题。证明了$M(X, K)$ 对于任何可元紧凑空间 $K$ 都是 Baire 的。
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On Baire property of spaces of compact-valued measurable functions
A topological space $X$ is Baire if the Baire Category Theorem holds for $X$, i.e., the intersection of any sequence of open dense subsets of $X$ is dense in $X$. One of the interesting problems in the theory of functional spaces is the characterization of the Baire property of a functional space through the topological property of the support of functions. In the paper this problem is solved for the space $M(X, K)$ of all measurable compact-valued ($K$-valued) functions defined on a measurable space $(X,\Sigma)$ with the topology of pointwise convergence. It is proved that $M(X, K)$ is Baire for any metrizable compact space $K$.
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