| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4617827 | Journal of Mathematical Analysis and Applications | 2011 | 9 Pages |
Abstract
This paper concerns a gap between hyponormality and subnormality for block Toeplitz operators. We show that there is no gap between 2-hyponormality and subnormality for a certain class of trigonometric block Toeplitz operators (e.g., its co-analytic outer coefficient is invertible). In addition we consider the extremal cases for the hyponormality of trigonometric block Toeplitz operators: in this case, hyponormality and normality coincide.
Related Topics
Physical Sciences and Engineering
Mathematics
Analysis
