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Inner derivations and norm equality |
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| Authors: | Mohamed Barraa Mohamed Boumazgour |
| Affiliation: | Département de Mathématiques, Faculté des sciences Semlalia B.P: 2390 Marrakech, Maroc ; Département de Mathématiques, Faculté des sciences Semlalia B.P: 2390 Marrakech, Maroc |
| Abstract: | We characterize when the norm of the sum of two bounded operators on a Hilbert space is equal to the sum of their norms. |
| Keywords: | Generalized derivation norm norm ideal $S$-universal operator numerical range spectrum quasi-nilpotent operator hyponormal operator. |
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