Unbounded strictly singular operators
β Scribed by R.W. Cross
- Publisher
- Elsevier Science
- Year
- 1988
- Weight
- 181 KB
- Volume
- 91
- Category
- Article
- ISSN
- 1385-7258
No coin nor oath required. For personal study only.
β¦ Synopsis
Let T: D(T) CX--, Y be an unbounded linear operator where X and Y are normed spaces. It is shown that if Y is complete then T is strictly singular if and only if T is the sum of a continuous strictly singular operator and an unbounded finite rank operator. A counterexample is constructed for the case in which Y is not complete.
π SIMILAR VOLUMES
## Abstract It is wellβknown that an operator __T__ β L(__E, F__) is strictly singular if β₯__T__~__x__~β₯β§Ξ»β₯__x__β₯ on a subspace __Z__ β __E__ implies dim __Z__ < + β. The present paper deals with ideals of operators defined by a condition β β₯__T__~__x__~β₯β§Ξ»β₯__x__β₯ on an infiniteβdimensional subspac
The stability of essential spectra of a closed, densely defined linear operator A on L -spaces, 1 F p F Ο±, when A is subjected to a perturbation by a bounded p strictly singular operator was discussed in a previous paper by K. Latrach and A. Ε½ .