2 papers
math.FA2014
Subnormal weighted shifts on directed trees whose nth powers have trivial domain
Piotr Budzynski, Zenon Jan Jablonski, Il Bong Jung +1
It is shown that for any positive integer n there exists a subnormal weighted shift on a directed tree whose nth power is closed and densely defined while its (n + 1)th power has t…
math.FA2014
On normal, formally normal and quasinormal composition operators in -spaces
Piotr Budzynski
Unbounded composition operators in -space over discrete measure spaces are investigated. Normal, formally normal and quasinormal composition operators acting in -spaces o…