指数 $-5/2$ 的贝塞尔函数系统的完备性

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
R. Khats
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引用次数: 0

摘要

让 $L^2((0;1);x^4 dx)$ 是所有可测函数 $f:(0;1)\rightarrow\mathbb C$ 的加权 Lebesgue 空间,满足 $\int_{0}^1 t^4 |f(t)|^2\, dt<+\infty$.让 $J_{-5/2}$ 是索引为 $-5/2$ 的第一类贝塞尔函数,$(\rho_k)_{k/in/mathbb N}$ 是一系列不同的非零复数。在空间 $L^2((0;1);x^4dx)$中,系统 $\big\{rho_k^2\sqrt{x\rho_k}J_{-5/2}(x\rho_k):k\in\mathbb N\big\}$ 的完备性的必要条件和充分条件是通过全函数找到的,全函数的零点集与序列 $(\rho_k)_{k\in\mathbb N}$ 重合。在这种情况下,我们研究了指数型 $\sigma\le 1$ 偶整函数的某类 $E_{4,+}$ 的积分表示。这是对 B. Vynnyts'kyi、V. Dilnyi、O. Shavala 和作者关于负半整数指数小于 $-1$ 的贝塞尔函数系统近似性质的类似结果的补充。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Completeness of the systems of Bessel functions of index $-5/2$
Let $L^2((0;1);x^4 dx)$ be the weighted Lebesgue space of all measurable functions $f:(0;1)\rightarrow\mathbb C$, satisfying $\int_{0}^1 t^4 |f(t)|^2\, dt<+\infty$. Let $J_{-5/2}$ be the Bessel function of the first kind of index $-5/2$ and $(\rho_k)_{k\in\mathbb N}$ be a sequence of distinct nonzero complex numbers. Necessary and sufficient conditions for the completeness of the system $\big\{\rho_k^2\sqrt{x\rho_k}J_{-5/2}(x\rho_k):k\in\mathbb N\big\}$ in the space $L^2((0;1);x^4 dx)$ are found in terms of an entire function with the set of zeros coinciding with the sequence $(\rho_k)_{k\in\mathbb N}$. In this case, we study an integral representation of some class $E_{4,+}$ of even entire functions of exponential type $\sigma\le 1$. This complements similar results on approximation properties of the systems of Bessel functions of negative half-integer index less than $-1$, due to B. Vynnyts'kyi, V. Dilnyi, O. Shavala and the author.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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