24 citations · 80 across the 39 of their papers we have counts for
4 papers · 2 filters
Unbounded quasinormal operators revisited
Zenon Jan Jablonski, Il Bong Jung, Jan Stochel
Various characterizations of unbounded closed densely defined operators commuting with the spectral measures of their moduli are established.In particular, Kaufman's definition of…
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…
Subnormal weighted shifts on directed trees and composition operators in spaces with non-densely defined powers
Piotr Budzynski, Piotr Dymek, Zenon Jan Jablonski +1
It is shown that for every positive integer there exists a subnormal weighted shift on a directed tree (with or without root) whose th power is densely defined while its $(n…
Unbounded Subnormal Composition Operators in L2-Spaces
Piotr Budzynski, Zenon Jan Jablonski, Il Bong Jung +1
A criterion for subnormality of unbounded composition operators in L2-spaces, written in terms of measurable families of probability measures satisfying the so-called consistency c…