S. Shamsigamchi

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20192026

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5 papers · 1 filter

math.FA2026

Nuclear Weighted composition operators between different $L^{p}$ -spaces

S. Al Ghafri, Y. Estaremi, S. Shamsigamchi

We provide complete characterisations of nuclear weighted composition operators between two distinct $L^{p} (μ)$ -spaces, where $1 \leq p < \infty$ . As a consequence, when the underlying…

math.FA2026

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 $L^{p} (μ)$ -spaces, for $1 \leq p < \infty$ . As a consequence, when the underlying measure space i…

math.FA2025

On a class of m-Isometric and Quasi-m-isometric operators

Y. Estaremi, M. S. Al Ghafri, S. Shamsigamchi

In this paper we characterize $m$ -isometric and quasi- $m$ -isometric weighted conditional type (WCT) operators on the Hilbert space $L^{2} (μ)$ . Also, we prove that the subclasses of $…

math.FA2023

Ascent and descent of WCT operators on Orlicz spaces

S. Nojoumi, S. Shamsigamchi

In this paper we are concerned with weighted conditional type(WCT) operators on Orlicz spaces. We prove that all WCT operators have finite ascent. Also, we provide some sufficient…

math.FA2019

Finite sum of weighted composition operators with closed range

Saeedeh Shamsigamchi, Abolghasem Alishahi, Ali Ebadian

In this paper, first we characterize closedness of range of the finite sum of weighted composition operators between different Lp-spaces. Then we discuss polar decomposition and in…