Minimal Norm Interpolation in Harmonic Hilbert Spaces and Wiener Amalgam Spaces on Locally Compact Abelian Groups

2005/02/04 by Hans G. Feichtinger, Feichtinger, Hans G., Sheel S. Pandey +4 · 1 citation
Computer Science · Mathematics · #41A05 #41A15 #43A15 #43A25 #Digital Filter Design and Implementation #FOS: Mathematics #Functional Analysis (math.FA) #Mathematical Analysis and Transform Methods #Spectral Theory in Mathematical Physics #math.FA #msc:41A05 #msc:41A15 #msc:43A15 #msc:43A25

paper · pdf · doi:10.48550/arxiv.math/0502093

16 pages

arxiv created 2005/02/04 · openalex publication_date 2005/02/04 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The family of harmonic Hilbert spaces is a natural enlargement of those classical L²-Sobolev space on \R^d which consist of continuous functions. In the present paper we demonstrate that the use of basic results from the theory of Wiener amalgam spaces allows to establish fundamental properties of harmonic Hilbert spaces even if they are defined over an arbitrary locally compact abelian group \G. Even for \G = \R^d this new approach improves previously known results. In this paper we present results on minimal norm interpolators over lattices and show that the infinite minimal norm interpolations are the limits of finite minimal norm interpolations. In addition, the new approach paves the way for the study of stability problems and error analysis for norm interpolations in harmonic Hilbert and Banach spaces on locally compact abelian groups.

Cited by

• Minimal-Norm Extensions of Stationary Kernels on Subgroups of Locally Compact Abelian Groups and Gaussian Conditioning

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