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arXiv 2104.02104math.FAmath.OA
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不变结构保持函数与Oka-Weil Kaplansky密度型定理

Invariant structure preserving functions and an Oka-Weil Kaplansky density type theorem

J. E. Pascoe

摘要:

在一般结构拓扑空间上发展了保结构不变和自由函数的理论。证明了在强拓扑中,一个保持不变结构的函数是多项式的适当模拟点态逼近的,因此是一个自由函数。此外,如果希尔伯特空间上的算子域是多项式凸的,则自由函数集满足Oka-Weil Kaplansky密度型定理--压缩函数可以用压缩多项式来近似。

英文摘要:

We develop the theory of invariant structure preserving and free functions on a general structured topological space. We show that an invariant structure preserving function is pointwise approximiable by the appropriate analog of polynomials in the strong topology and therefore a free function. Moreover, if a domain of operators on a Hilbert space is polynomially convex, the set of free functions satisfies a Oka-Weil Kaplansky density type theorem -- contractive functions can be approximated by contractive polynomials.

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