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arXiv 1707.04054math.CV
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关于全纯系数幂级数的收敛集

On Convergence Sets of Power Series with Holomorphic Coefficients

Basma Al-Shutnawi, Hua Liu, Daowei Ma

摘要:

我们考虑形式为$f(z,t)=\sum_{n=0}^{\infty} f_n(z)t^n$的形式幂级数的收敛集,其中$f_n(z)$是$\mathbb{C}$中的区域$Ω$上的全纯函数. $Ω$的子集$E$称为$Ω$中的收敛集,如果存在一个级数$f(z,t)$使得$E$恰好是$z$的点集,对于该点集$f(z,t)$在原点的某个邻域中收敛为单变量$t$的幂级数。$σ$ -凸集定义为多项式凸紧子集的可数集合的并。证明了$\mathbb{C}$的子集是收敛集当且仅当它是$σ$ -凸的.

英文摘要:

We consider convergence sets of formal power series of the form $f(z,t)=\sum_{n=0}^{\infty} f_n(z)t^n$, where $f_n(z)$ are holomorphic functions on a domain $Ω$ in $\mathbb{C}$. A subset $E$ of $Ω$ is said to be a convergence set in $Ω$ if there is a series $f(z,t)$ such that $E$ is exactly the set of points $z$ for which $f(z,t)$ converges as a power series in a single variable $t$ in some neighborhood of the origin. A $σ$-convex set is defined to be the union of a countable collection of polynomially convex compact subsets. We prove that a subset of $\mathbb{C}$ is a convergence set if and only if it is $σ$-convex.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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