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Holomorphic functions with universal boundary behaviour
Journal of Approximation Theory ( IF 0.9 ) Pub Date : 2020-02-20 , DOI: 10.1016/j.jat.2020.105391
S. Charpentier

We are interested in functions analytic in the unit disc D of the complex plane with a wild behaviour near the boundary T of D. For instance, the main result implies the existence of a residual subset of H(D) every element f of which satisfies the property that, given any compact subset K of T, different from T, any continuous function φ on K, and any compact set L of D, there exists an increasing sequence (rn)n[0,1) converging to 1, such that frn(ζz)+z converges to φ(ζ), uniformly for (ζ,z)K×L, as n goes to . Among other things, radial growth of such functions and connections with universal Taylor series are investigated. Functions in the disc algebra whose derivatives disjointly satisfy a somewhat similar universal property, are also exhibited. In some sense, the results are sharp.



中文翻译:

具有通用边界行为的全纯函数

我们对单元盘中的功能分析感兴趣 d 边界附近具有狂野行为的复杂平面 Ťd。例如,主要结果意味着存在一个残差子集Hd 每个元素 F 给定紧凑的子集,其中的一个满足 ķŤ, 不同于 Ť,任何连续函数 φķ,以及任何紧凑套装 大号d,存在一个增加的序列 [Rññ[01个 收敛到1,这样 F[Rñζ-ž+ž 收敛到 φζ,统一用于 ζžķ×大号,作为 ñ。其中,研究了这种函数的径向增长以及与通用泰勒级数的联系。还显示了圆盘代数中的函数,它们的导数不相交地满足了某种相似的通用性。从某种意义上讲,结果是清晰的。

更新日期:2020-02-20
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