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math.FA2016
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…
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…