J. Stochel

activity

20092026

most citedOn Unbounded Composition Operators in

L^{2}

-Spaces

24 citations · 80 across the 39 of their papers we have counts for

collaborators

Showing 2020Show all

3 papers · 1 filter

math.FA2020★ 16 cited

Subnormal $n$ th roots of quasinormal operators are quasinormal

Paweł Pietrzycki, Jan Stochel

In the recent paper, R. E. Curto, S. H. Lee, J. Yoon, asked the following question: Let $A$ be a subnormal operator, and assume that $A^{2}$ is quasinormal. Does it follow that $A$ i…

math.FA2020★ 1 cited

Conditionally positive definiteness in operator theory

Zenon Jan Jabłoński, Il Bong Jung, Jan Stochel

In this paper we extensively investigate the class of conditionally positive definite operators, namely operators generating conditionally positive definite sequences. This class i…

math.FA2020

The Cauchy dual subnormality problem for cyclic $2$ -isometries

Akash Anand, Sameer Chavan, Zenon Jan Jabłoński +1

The Cauchy dual subnormality problem asks whether the Cauchy dual operator of a $2$ -isometry is subnormal. Recently this problem has been solved in the negative. Here we show that…

Subnormal nth roots of quasinormal operators are quasinormal

Conditionally positive definiteness in operator theory

The Cauchy dual subnormality problem for cyclic 2-isometries

Subnormal $n$ th roots of quasinormal operators are quasinormal

The Cauchy dual subnormality problem for cyclic $2$ -isometries