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pro vyhledávání: '"van Schagen, F."'
This paper is concerned with the Wiener-Hopf indices of unimodular rational matrix functions on the imaginary axis. These indices play a role in the Fredholm theory for Wiener-Hopf integral operators. Our main result gives formulas for the Wiener-Hop
Externí odkaz:
http://arxiv.org/abs/2406.09472
Inspired by the paper of Groenewald, Kaashoek and Ran (Wiener-Hopf indices of unitary functions on the unit circle in terms of realizations and related results on Toeplitz operators. \emph{Indag. Math.} 28, (2017), 649-710), we present an operator-th
Externí odkaz:
http://arxiv.org/abs/2308.05488
Publikováno v:
In Linear Algebra and Its Applications 15 September 2024 697:201-231
Akademický článek
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Publikováno v:
Journal of Mathematical Analysis and Applications 452 (2017), 846-870
In this paper a twofold inverse problem for orthogonal matrix functions in the Wiener class is considered. The scalar-valued version of this problem was solved by Ellis and Gohberg in 1992. Under reasonable conditions, the problem is reduced to an in
Externí odkaz:
http://arxiv.org/abs/1804.08604
Publikováno v:
Operator Theory: Advances and Applications, 2019
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 sol
Externí odkaz:
http://arxiv.org/abs/1804.08520
Publikováno v:
In Journal of Mathematical Analysis and Applications 15 August 2017 452(2):846-870
Publikováno v:
Frazho, A E, Kaashoek, R & van Schagen, F 2022, ' Toeplitz operators from a higher point of view: contraction-structured operators ', Pure and Applied Functional Analysis, vol. 7, no. 1, pp. 253-270 . < http://yokohamapublishers.jp/online2/oppafa/vol7/p253.html >
Pure and Applied Functional Analysis, 7(1), 253-270
Pure and Applied Functional Analysis, 7(1), 253-270
This paper is concerned with self-adjoint Hilbert space operators Tthat have a special displacement structure depending on a given contraction A.It allows one to view the operator T as a compression of a self-adjoint Toeplitzoperator. The main issue
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::cf18217044fe6ede77d0336595ee8744
https://hdl.handle.net/1871.1/ab33b50d-f9e5-4e74-a015-b7d868d3a63d
https://hdl.handle.net/1871.1/ab33b50d-f9e5-4e74-a015-b7d868d3a63d
Akademický článek
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Autor:
Kaashoek, M.A., van Schagen, F.
Publikováno v:
Mathematical Proceedings of the Royal Irish Academy, 2013 Dec 01. 113A(2), 107-130.
Externí odkaz:
https://www.jstor.org/stable/42912518