8 papers
Weighted conditional expectation operators and nuclearity
M. S. Al Ghafri, S. Shamsigamchi, Y. Estaremi
We provide a characterisations of nuclear weighted conditional expectation operators on -spaces, for . As a consequence, when the underlying measure space i…
Continuity of conditional expectation in Orlicz spaces
A. Hosseini, Y. Estaremi
The continuity of conditional expectation on Orlicz spaces is investigated. Indeed, we provide some necessary and sufficient conditions on a sequence $\{\mathcal{A}_n\}_{n\in\mathb…
On a class of m-Isometric and Quasi-m-isometric operators
Y. Estaremi, M. S. Al Ghafri, S. Shamsigamchi
In this paper we characterize -isometric and quasi--isometric weighted conditional type (WCT) operators on the Hilbert space . Also, we prove that the subclasses of $…
Isometric and Quasi-isometric weighted composition operators
M. S. Al Ghafri, Y. Estaremi, M. Z. Gashti
In this paper we characterize -isometric and quasi--isometric weighted composition operators on the Hilbert space . Also, we find that normal--isometry and normal…
Composition operators on some semi-Hilbert spaces
Y. Estaremi, M. S. Al Ghafri
This paper investigates composition operators and weighted composition operators on semi-Hilbert spaces induced by positive multiplication operators on \( L^2(μ) \). Within the fra…
On a class of lambda-hyponormal operators
Y. Estaremi, M. S. Al Ghafri, and S. Shamsigamchi
In this paper we define -hyponormal operators on an infinite dimensional Hilbert space and find a class of -hyponormal operators that can not be hypercyclic. Al…
Riemann-Stieltjes operators on some general spaces on the unit ball and their essential norm
M. S. Al Ghafri, M. Hassanlou, Y. Estaremi +1
The objective of this paper is to find an estimation of the essential norm of Riemann-Stieltjes operator from the spaces ( general function space) and (mixed-…
Essential norm of generalized Integral type Operators from Mixed-Norm to Zygmund-Type Spaces
Y. Estaremi, M. Hassanlou, M. S. Al Ghafri
In this paper, we consider the generalized integration operator from mixed-norm space into Zygmund-type and Bloch-type spaces and find an estimation for the essential norm of this…