2 citations · 2 across the 7 of their papers we have counts for
7 papers
When is a CPD weighted shift similar to a subnormal operator?
Zenon Jan Jabłoński, Il Bong Jung, Jan Stochel
We prove that a CPD unilateral weighted shift of type III is a quasi-affine transform of the operator of multiplication by the independent variable on the -clos…
Convergence of power sequences of operators via their stability
Zenon Jan Jabłoński, Il Bong Jung, Carlos Kubrusly +1
This paper is concerned with the convergence of power sequences and stability of Hilbert space operators, where "convergence" and "stability" refer to weak, strong and norm topolog…
Criteria for algebraic operators to be unitary
Zenon Jan Jablonski, Il Bong Jung, Jan Stochel
Criteria for an algebraic operator on a complex Hilbert space to be unitary are established. The main one is written in terms of the convergence of sequences of t…
Convergence of power sequences of B-operators with applications to stability
Sameer Chavan, Zenon Jan Jabłoński, Il Bong Jung +1
The B-operators (abbreviation for Brownian-type operators) are upper triangular 2x2 block matrix operators that satisfy certain algebraic constraints. The purpose of this paper is…
Lifting Brownian-type operators with subnormal entry
Sameer Chavan, Zenon Jan Jablonski, Il Bong Jung +1
In this paper, we study Brownian-type operators, which are upper triangular block matrix operators with entries satisfying some algebraic constraints. We establish a li…
Semi-cubic hyponormality of weighted shifts with stampfli recursive tail
Seunghwan Baek, George R. Exner, Il Bong Jung +1
Let be a backward -step extension of a recursive weight sequence and let be the weighted…