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arXiv 1503.05178math.CV
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De Branges空间中带导数的插值公式

Interpolation Formulas With Derivatives in De Branges Spaces

Felipe Gonçalves

摘要:

证明了指数型整函数的一个含导数的插值公式。本文将J.Vaaler在[37,定理9]中导出的插值公式推广到一般的$L^p$ de Branges空间.我们广泛地使用来自de Branges的整函数的希尔伯特空间理论的技术,如在[6]中所发展的,但是关键的段落涉及到在[15]中导出的希尔伯特型不等式。我们给出应用程序的齐性空间的整函数,涉及贝塞尔函数,我们证明了一个唯一性结果的极值单边带限逼近的径向函数在欧几里得空间。

英文摘要:

The purpose of this paper is to prove an interpolation formula involving derivatives for entire functions of exponential type. We extend the interpolation formula derived by J. Vaaler in [37, Theorem 9] to general $L^p$ de Branges spaces. We extensively use techniques from de Branges' theory of Hilbert spaces of entire functions as developed in [6], but a crucial passage involves the Hilbert-type inequalities as derived in [15]. We give applications to homogeneous spaces of entire functions that involve Bessel functions and we prove a uniqueness result for extremal one-sided band-limited approximations of radial functions in Euclidean spaces.

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