A toeplitz-like operator with rational symbol having poles on the unit circle i: Fredholm properties

G. J. Groenewald; S. ter Horst; J. Jaftha; A. C.M. Ran

doi:10.1007/978-3-030-04269-1_10

A toeplitz-like operator with rational symbol having poles on the unit circle i: Fredholm properties

G. J. Groenewald^*, S. ter Horst, J. Jaftha, A. C.M. Ran

^*Corresponding author for this work

Mathematics

Research output: Chapter in Book / Report / Conference proceeding › Chapter › Academic › peer-review

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Abstract

In this paper a definition is given for an unbounded Toeplitzlike operator with rational symbol which has poles on the unit circle. It is shown that the operator is Fredholm if and only if the symbol has no zeroes on the unit circle, and a formula for the index is given as well. Finally, a matrix representation of the operator is discussed.

Original language	English
Title of host publication	Operator Theory, Analysis and the State Space Approach
Subtitle of host publication	In Honor of Rien Kaashoek
Publisher	Springer International Publishing Switzerland
Pages	239-268
Number of pages	30
ISBN (Electronic)	9783030042691
ISBN (Print)	9783030042684
DOIs	https://doi.org/10.1007/978-3-030-04269-1_10
Publication status	Published - 2018

Publication series

Name	Operator Theory: Advances and Applications
Volume	271
ISSN (Print)	0255-0156
ISSN (Electronic)	2296-4878

Funding

This work is based on the research supported in part by the National Research Foundation of South Africa (Grant Number 90670 and 93406). Part of the research was done during a sabbatical of the third author, in which time several research visits to VU Amsterdam and North-West University were made. Support from University of Cape Town and the Department of Mathematics, VU Amsterdam is gratefully acknowledged. Acknowledgement. The present work is based on research supported in part by the National Research Foundation of South Africa. Any opinion, finding and conclusion or recommendation expressed in this material is that of the authors and the NRF does not accept any liability in this regard.

Funders	Funder number
National Research Foundation
National Research Foundation of South Africa	90670, 93406
National Research Foundation

Keywords

Fredholm properties
Toeplitz operators
Unbounded operators

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10.1007/978-3-030-04269-1_10

Groenewald2018_Chapter_AToeplitz-likeOperatorWithRationalSymbolFinal published version, 566 KBLicence: Article 25fa Dutch Copyright Act

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Groenewald, G. J., ter Horst, S., Jaftha, J., & Ran, A. C. M. (2018). A toeplitz-like operator with rational symbol having poles on the unit circle i: Fredholm properties. In Operator Theory, Analysis and the State Space Approach: In Honor of Rien Kaashoek (pp. 239-268). (Operator Theory: Advances and Applications; Vol. 271). Springer International Publishing Switzerland. https://doi.org/10.1007/978-3-030-04269-1_10

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Groenewald, GJ, ter Horst, S, Jaftha, J & Ran, ACM 2018, A toeplitz-like operator with rational symbol having poles on the unit circle i: Fredholm properties. in Operator Theory, Analysis and the State Space Approach: In Honor of Rien Kaashoek. Operator Theory: Advances and Applications, vol. 271, Springer International Publishing Switzerland, pp. 239-268. https://doi.org/10.1007/978-3-030-04269-1_10

A toeplitz-like operator with rational symbol having poles on the unit circle i: Fredholm properties. / Groenewald, G. J.; ter Horst, S.; Jaftha, J. et al.
Operator Theory, Analysis and the State Space Approach: In Honor of Rien Kaashoek. Springer International Publishing Switzerland, 2018. p. 239-268 (Operator Theory: Advances and Applications; Vol. 271).

Research output: Chapter in Book / Report / Conference proceeding › Chapter › Academic › peer-review

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Groenewald GJ, ter Horst S, Jaftha J, Ran ACM. A toeplitz-like operator with rational symbol having poles on the unit circle i: Fredholm properties. In Operator Theory, Analysis and the State Space Approach: In Honor of Rien Kaashoek. Springer International Publishing Switzerland. 2018. p. 239-268. (Operator Theory: Advances and Applications). Epub 2018 Dec 31. doi: 10.1007/978-3-030-04269-1_10

A toeplitz-like operator with rational symbol having poles on the unit circle i: Fredholm properties

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