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Mathematics > Functional Analysis

arXiv:1804.08520 (math)
[Submitted on 23 Apr 2018]

Title:The twofold Ellis-Gohberg inverse problem in an abstract setting and applications

Authors:S. ter Horst, M.A. Kaashoek, F. van Schagen
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Abstract:In this paper we consider a twofold Ellis-Gohberg type inverse problem in an abstract *-algebraic setting. Under natural assumptions, necessary and sufficient conditions for the existence of a solution are obtained, and it is shown that in case a solution exists, it is unique. The main result relies strongly on an inversion formula for a $2\times 2$ block operator matrix whose off diagonal entries are Hankel operators while the diagonal entries are identity operators. Various special cases are presented, including the cases of matrix-valued $L^1$-functions on the real line and matrix-valued Wiener functions on the unit circle of the complex plane. For the latter case, it is shown how the results obtained in an earlier publication by the authors can be recovered.
Comments: 52 pages
Subjects: Functional Analysis (math.FA)
MSC classes: 47A56, 15A29, 47B35, 47G10
Cite as: arXiv:1804.08520 [math.FA]
  (or arXiv:1804.08520v1 [math.FA] for this version)
  https://doi.org/10.48550/arXiv.1804.08520
Journal reference: Operator Theory: Advances and Applications, 2019
Related DOI: https://doi.org/10.1007/978-3-030-11614-9_8

Submission history

From: Sanne ter Horst [view email]
[v1] Mon, 23 Apr 2018 15:48:20 UTC (46 KB)
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