نتایج جستجو برای: weighted composition operator

تعداد نتایج: 448230  

‎In this paper, we provide a complete description of weighted composition operators between extended Lipschitz algebras on compact metric spaces. We give necessary and sufficient conditions for the injectivity and the sujectivity of these operators. We also obtain some sufficient conditions and some necessary conditions for a weighted composition operator between these spaces to be compact.

Journal: :bulletin of the iranian mathematical society 0
h. emamalipour faculty of mathematical sciences‎, ‎university of tabriz‎, ‎p.o‎. ‎box 5166615648‎, ‎tabriz‎, ‎iran. m. r. jabbarzadeh faculty of mathematical sciences‎, ‎university of tabriz‎, ‎p.o‎. ‎box 5166615648‎, ‎tabriz‎, ‎iran. z. moayyerizadeh faculty of mathematical sciences‎, ‎university of tabriz‎, ‎p.o‎. ‎box 5166615648‎, ‎tabriz‎, ‎iran.

in this article, we discuss measure theoretic characterizations for weighted composition operators in some operator classes on $l^{2}(sigma)$ such as, $n$-power normal, $n$-power quasi-normal, $k$-quasi-paranormal and quasi-class$a$. then we show that weighted composition operators can separate these classes.

Journal: :bulletin of the iranian mathematical society 0
sh. rezaei islamic azad university, iran h. mahyar tarbiat moallem university, iran

in this paper we obtain lower and upper estimates for the essential norms of generalized composition operators from weighted dirichlet spaces or bloch type spaces to $q_k$ type spaces.

Journal: :Journal of Function Spaces and Applications 2013

2011

We study weighted composition operators on Hilbert spaces of analytic functions on the unit ball with kernels of the form (1− 〈z, w〉)−γ for γ > 0. We find necessary and sufficient conditions for the adjoint of a weighted composition operator to be a weighted composition operator or the inverse of a weighted composition operator. We then obtain characterizations of self-adjoint and unitary weigh...

Journal: :bulletin of the iranian mathematical society 2013
sh. rezaei h. mahyar

in this paper we obtain lower and upper estimates for the essential norms of generalized composition operators from weighted dirichlet spaces or bloch type spaces to $q_k$ type spaces.

2014
Valentin Matache VALENTIN MATACHE

A composition operator is an operator on a space of functions defined on the same set. Its action is by composition to the right with a fixed selfmap of that set. A composition operator followed by a multiplication operator is called a weighted composition operator. In this paper, we study when weighted composition operators on the Hilbert Hardy space of the open unit disc are isometric. We fin...

Journal: :Proceedings of the American Mathematical Society 2007

Journal: :Banach Journal of Mathematical Analysis 2020

Journal: :Proceedings of the American Mathematical Society 2006

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