Spain, P. G. (2017) Numerical range of a simple compression. Functional Analysis, Approximation and Computation, 9(1), pp. 25-35.
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Publisher's URL: http://operator.pmf.ni.ac.rs/www/pmf/publikacije/faac/2017/FAAC-9-1/faac-9-1-2.pdf
Abstract
The numerical range of a contraction acting on L(C2) is identified, so allowing one to exhibit a hermitian projection that is not ultrahermitian. An explicit formula for the norm of the associated operator κm translates into a family of inequalities in four complex variables.
| Item Type: | Articles |
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| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Spain, Dr Philip |
| Authors: | Spain, P. G. |
| College/School: | College of Science and Engineering > School of Mathematics and Statistics |
| Journal Name: | Functional Analysis, Approximation and Computation |
| Publisher: | Faculty of Science and Mathematics, University of Nis, Serbia |
| ISSN: | 1821-410X |
| ISSN (Online): | 2406-1573 |
| Copyright Holders: | Copyright © 2017 The Author |
| First Published: | First published in Functional Analysis, Approximation and Computation 9(1): 25-35 |
| Publisher Policy: | Reproduced in accordance with the publisher copyright policy |
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