Examples of cyclic polynomially bounded operators that are not similar to contractions
Fuente:
arXiv
Enregistré dans:
| Auteur principal: | |
|---|---|
| Format: | Preprint |
| Publié: |
2024
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866909433282428928 |
|---|---|
| author | Gamal', Maria F. |
| author_facet | Gamal', Maria F. |
| contents | A question if a polynomially bounded operator is similar to a contraction was posed by Halmos and was answered in the negative by Pisier. His counterexample is an operator of infinite multiplicity, while all its restrictions on invariant subspaces of finite multiplicity are similar to contractions. In the paper, cyclic polynomially bounded operators which are not similar to contractions and are quasisimilar to $C_0$-contractions or to isometries are constructed. The construction is based on a perturbation of the sequence of finite dimensional operators which is uniformly polynomially bounded, but is not uniformly completely polynomially bounded, constructed by Pisier. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_14130 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Examples of cyclic polynomially bounded operators that are not similar to contractions Gamal', Maria F. Functional Analysis 47A65, 47A60, 47A16, 47A20, 47A55 A question if a polynomially bounded operator is similar to a contraction was posed by Halmos and was answered in the negative by Pisier. His counterexample is an operator of infinite multiplicity, while all its restrictions on invariant subspaces of finite multiplicity are similar to contractions. In the paper, cyclic polynomially bounded operators which are not similar to contractions and are quasisimilar to $C_0$-contractions or to isometries are constructed. The construction is based on a perturbation of the sequence of finite dimensional operators which is uniformly polynomially bounded, but is not uniformly completely polynomially bounded, constructed by Pisier. |
| title | Examples of cyclic polynomially bounded operators that are not similar to contractions |
| topic | Functional Analysis 47A65, 47A60, 47A16, 47A20, 47A55 |
| url | https://arxiv.org/abs/2412.14130 |