Nearly subnormal operators and moment problems
The authors use separation-of-cones techniques and ideas from multivariable operator theory to show that polynomial hyponormality does not imply subnormality for Hilbert space operators. As an application, they obtain a new result in the theory of power moments in two main dimensions.
polynomial hyponormality does not imply subnormality
theory of power moments in two main dimensions
scientific article; zbMATH DE number 515240