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On essential spectra of operator-matrices and their Feshbach maps |
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| Authors: | J. Lutgen |
| Affiliation: | Fachbereich Mathematik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany |
| Abstract: | A connection between the essential spectrum of certain operator-matrices and essential spectra of the corresponding “Feshbach maps” is discussed and applied to some concrete rational operator-valued functions. |
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