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On a question of Olsen concerning compact perturbations of operators. (English) Zbl 0375.47009


MSC:

47A55 Perturbation theory of linear operators
47A30 Norms (inequalities, more than one norm, etc.) of linear operators
47B06 Riesz operators; eigenvalue distributions; approximation numbers, \(s\)-numbers, Kolmogorov numbers, entropy numbers, etc. of operators
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