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On derivation ranges. (English) Zbl 0355.47025


MSC:

47C15 Linear operators in \(C^*\)- or von Neumann algebras
47B06 Riesz operators; eigenvalue distributions; approximation numbers, \(s\)-numbers, Kolmogorov numbers, entropy numbers, etc. of operators
47B40 Spectral operators, decomposable operators, well-bounded operators, etc.
47B47 Commutators, derivations, elementary operators, etc.
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