3 papers
math.FA2023
On a construction method of new moment sequences
Seunghwan Baek, Hayoung Choi, Seonguk Yoo
In this paper we provide a way to construct new moment sequences from a given moment sequence. An operator based on multivariate positive polynomials is applied to get the new mome…
math.FA2018
Semi-cubically hyponormal weighted shifts with Stampfi's subnormal completion
Seunghwan Baek, Mi Ryeong Lee
Let be a weight sequence with Stampfli's subnormal completion and let be its associated weighted shift. In this paper we discuss some…
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…