Approximation with normal operators with finite spectrum, and an elementary proof of a Brown-Douglas-Fillmore theorem.

DOI10.2140/pjm.2001.199.347zbMath1065.47013OpenAlexW2052996482MaRDI QIDQ1858145

Peter Friis, Mikael Rørdam

Publication date: 12 February 2003

Published in: Pacific Journal of Mathematics (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.2140/pjm.2001.199.347

zbMATH Keywords

index functionessentially normal operatorapproximating normal operators

Mathematics Subject Classification ID

Spectrum, resolvent (47A10) Subnormal operators, hyponormal operators, etc. (47B20) General theory of (C^*)-algebras (46L05) Linear operator approximation theory (47A58)

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