28 citations · 140 across the 16 of their papers we have counts for
17 papers
Semi-hyponormality of commuting pairs of Hilbert space operators
Raul E. Curto, Jasang Yoon
We first find an explicit formula for the square root of positive operator matrices with commuting entries, and then use it to define and study semi-hyponormality for…
Solution of the Reconstruction-of-the-Measure Problem for Canonical Invariant Subspaces
Raul E. Curto, Sang Hoon Lee, Jasang Yoon
We study the Reconstruction-of-the-Measure Problem (ROMP) for commuting 2-variable weighted shifts , when the initial data are given as the Berger measure of the restric…
Polynomial embeddings of unilateral weighted shifts into -variable weighted shifts
Raul E. Curto, Sang Hoon Lee, Jasang Yoon
Given a bounded sequence ωof positive numbers and its associated unilateral weighted shift W_ω acting on the Hilbert space \ell^2(\mathbb{Z}_+), we consider natural representations…
The Spectral Picture and Joint Spectral Radius of the Generalized Spherical Aluthge Transform
Chafiq Benhida, Raul E. Curto, Sang Hoon Lee +1
For an arbitrary commuting --tuple $\bT$ of Hilbert space operators, we fully determine the spectral picture of the generalized spherical Aluthge transform $\dbT$ and we prove t…
Quasinormality of powers of commuting pairs of bounded operators
Raul E. Curto, Sang Hoon Lee, Jasang Yoon
We study jointly quasinormal and spherically quasinormal pairs of commuting operators on Hilbert space, as well as their powers. We first prove that, up to a constant multiple, the…
Joint spectra of spherical Aluthge transforms of commuting n-tuples of Hilbert space operators
Chafiq Benhida, Raul E. Curto, Sang Hoon Lee +1
Let be a commuting -tuple of operators on a Hilbert space , and let be its canonical join…