论可元空间上 $C_p$ 空间之间的均匀连续投射

A. Eysen, A. Leiderman, V. Valov
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引用次数: 0

摘要

让 $X$ 和 $Y$ 是可元空间,并假设存在一个均匀连续的投射 $T: C_{p}(X) \to C_{p}(Y)$ (或者,$T:C_{p}^*(X) \to C_{p}^*(Y)$),其中 $C_{p}(X)$ (或者、$C_{p}^*(X)$)表示在 $X$ 上所有实值连续(或者说,连续且有界)函数的空间,并赋有点式收敛拓扑。我们证明,如果另外$T$是一个反向有界映射,并且$X$具有某种类似维度的性质$\mathcal P$,那么$Y$也是如此。例如,如果 $\mathcal P$ 是以下性质之一:零维、可数维或强可数维,那么这就是真的。此外,我们还考虑了 $\mathcal P$ 的其他性质:散射空间或强 $\sigma$ 散射空间,或 $\Delta_1$ 空间(见 [17])。我们的结果加强并扩展了[6]、[13]、[17]中的一些结果。
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On uniformly continuous surjections between $C_p$-spaces over metrizable spaces
Let $X$ and $Y$ be metrizable spaces and suppose that there exists a uniformly continuous surjection $T: C_{p}(X) \to C_{p}(Y)$ (resp., $T: C_{p}^*(X) \to C_{p}^*(Y)$), where $C_{p}(X)$ (resp., $C_{p}^*(X)$) denotes the space of all real-valued continuous (resp., continuous and bounded) functions on $X$ endowed with the pointwise convergence topology. We show that if additionally $T$ is an inversely bounded mapping and $X$ has some dimensional-like property $\mathcal P$, then so does $Y$. For example, this is true if $\mathcal P$ is one of the following properties: zero-dimensionality, countable-dimensionality or strong countable-dimensionality. Also, we consider other properties $\mathcal P$: of being a scattered, or a strongly $\sigma$-scattered space, or being a $\Delta_1$-space (see [17]). Our results strengthen and extend several results from [6], [13], [17].
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