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 |