IL Bong Jung

collaborators

2 papers

math.FA2026

CPD $n$ th roots of subnormal operators are subnormal

Zenon Jan JabÅoÅski, Il Bong Jung, PaweÅ Pietrzycki +1

We investigate the $n$ th root problem for bounded operators on a Hilbert space within the class of conditionally positive definite (CPD) operators determined by the LÃ©vy--Khintchi…

math.FA2024

When is a CPD weighted shift similar to a subnormal operator?

Zenon Jan JabÅoÅski, Il Bong Jung, Jan Stochel

We prove that a CPD unilateral weighted shift $W_{I^} »$ of type III is a quasi-affine transform of the operator $M_{z}$ of multiplication by the independent variable on the $L^{2} (I ¨ )$ -cl…

CPD nth roots of subnormal operators are subnormal

When is a CPD weighted shift similar to a subnormal operator?

CPD $n$ th roots of subnormal operators are subnormal