scientific article
DOI10.1512/IUMJ.1992.41.41002zbMath0787.47018OpenAlexW4231502103MaRDI QIDQ4024762
Publication date: 10 February 1993
Published in: Indiana University Mathematics Journal (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.1512/iumj.1992.41.41002
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
distance formulasimilarity invariantessential minimum modulusessential resolvent setapproximation theory of Hilbert space operatorsdistance from an arbitrary operator to a given class of operatorsessentially \(G_ 1\) operators
Linear operators defined by compactness properties (47B07) Perturbation theory of linear operators (47A55) Structure theory of linear operators (47A65)
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