نتایج جستجو برای: composition operators

تعداد نتایج: 355541  

ژورنال: پژوهش های ریاضی 2016
Estaremi , Y, Shamsi Gomechi, S,

This article has no abstract.

In this paper, we consider weighted composition operators betweenmeasurable differential forms and then some classic properties of these operators are characterized.

Journal: :bulletin of the iranian mathematical society 0
a. kamal port said university‎, ‎faculty of science‎, ‎department of mathematics, port said 42521‎, ‎egypt.

‎in this paper‎, ‎we investigate some results on natural metrics on the $mu$-normal functions and meromorphic $q_p$-classes‎. ‎also‎, ‎these classes are shown to be complete metric spaces with respect to the corresponding metrics‎. ‎moreover‎, ‎compact composition operators $c_phi$ and lipschitz continuous operators acting from $mu$-normal functions to the meromorphic $q_p$-classes are characte...

Norm and essential norm of differences of differentiation composition operators between Bloch spaces have been estimated in this paper. As a result, we find characterizations for boundedness and compactness of these operators.

Journal: :Bulletin of the Australian Mathematical Society 1978

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 2015
y. x. liang z. h. zhou

we give some sufficient conditions under which the tuple of the adjoint of weighted composition operators $(c_{omega_1,varphi_1}^*‎ , ‎c_{omega_2,varphi_2}^*)$ on the hilbert space $mathcal{h}$ of analytic functions is supercyclic‎.

Journal: :bulletin of the iranian mathematical society 2015
a. abdollahi s. mehrangiz t. roientan

let $varphi(z)=z^m, z in mathbb{u}$, for some positive integer $m$, and $c_varphi$ be the composition operator on the bergman space $mathcal{a}^2$ induced by $varphi$. in this article, we completely determine the point spectrum, spectrum, essential spectrum, and essential norm of the operators $c^*_varphi c_varphi, c_varphi c^*_varphi$ as well as self-commutator and anti-self-commutators of $c_...

Journal: :journal of linear and topological algebra (jlta) 2014
d alimohammadi s sedgar

we characterize compact composition operators on real banach spaces of complex-valued bounded lipschitz functions on metric spaces, not necessarily compact, with lipschitz involutions and determine their spectra.

Journal: :Proceedings of the American Mathematical Society 1988

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