A continuous lower estimate for the distance between an operator and compact perturbations of normal operators

zbMath0284.47017MaRDI QIDQ1845195

Tin Kin Wong, Takashi Ito

Publication date: 1973

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

Mathematics Subject Classification ID

Hermitian and normal operators (spectral measures, functional calculus, etc.) (47B15) Riesz operators; eigenvalue distributions; approximation numbers, (s)-numbers, Kolmogorov numbers, entropy numbers, etc. of operators (47B06) Perturbation theory of linear operators (47A55) (Semi-) Fredholm operators; index theories (47A53)

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