1 citations · 2 across the 5 of their papers we have counts for
7 papers
Conditionally positive definite unilateral weighted shifts
Zenon Jan Jabłoński, Il Bong Jung, Eun Young Lee +1
In a recent paper [15], Hilbert space operators with the property that each sequence of the form is conditionally positive definite in a semigr…
Conditionally positive definiteness in operator theory
Zenon Jan Jabłoński, Il Bong Jung, Jan Stochel
In this paper we extensively investigate the class of conditionally positive definite operators, namely operators generating conditionally positive definite sequences. This class i…
The Cauchy dual subnormality problem for cyclic -isometries
Akash Anand, Sameer Chavan, Zenon Jan Jabłoński +1
The Cauchy dual subnormality problem asks whether the Cauchy dual operator of a -isometry is subnormal. Recently this problem has been solved in the negative. Here we show that…
Taylor spectrum approach to Brownian-type operators with quasinormal entry
Sameer Chavan, Zenon Jan Jabłoński, Il Bong Jung +1
In this paper, we introduce operators that are represented by upper triangular block matrices whose entries satisfy some algebraic constraints. We call them Brownian-ty…
Complete systems of unitary invariants for some classes of -isometries
Akash Anand, Sameer Chavan, Zenon Jan Jabłoński +1
The unitary equivalence of -isometric operators satisfying the so-called kernel condition is characterized. It relies on a model for such operators built on operator valued unil…
A solution to the Cauchy dual subnormality problem for 2-isometries
Akash Anand, Sameer Chavan, Zenon Jan Jabłoński +1
The Cauchy dual subnormality problem asks whether the Cauchy dual operator of a -isometry is subnormal. In the present paper we show that the prob…
Unbounded Weighted Composition Operators in L2-Spaces
Piotr Budzyński, Zenon Jan Jabłoński, Il Bong Jung +1
Bounded and unbounded weighted composition operators on spaces over -finite measure spaces are investigated. A variety of questions related to seminormality of such operat…