Results 11 to 20 of about 850,915 (318)

Inequalities Involving Essential Norm Estimates of Product-Type Operators [PDF]

open access: yesJournal of Mathematics, 2021
Consider an open unit disk D=z∈ℂ ...
Manisha Devi, Ajay K. Sharma, Kuldip Raj
doaj   +2 more sources

Norms and essential norms of linear combinations of endomorphisms [PDF]

open access: bronzeTransactions of the American Mathematical Society, 2004
We compute norms and essential norms of linear combinations of endomorphisms on uniform algebras.
Pamela Gorkin, Raymond Mortini
openalex   +3 more sources

Product-type Operators Between Minimal M\"{o}bius Invariant Spaces and Zygmund Type Spaces [PDF]

open access: yesSahand Communications in Mathematical Analysis, 2023
In this work,  we consider product-type  operators $T^m_{u,v,\varphi}$ from minimal M\"{o}bius invariant spaces into Zygmund-type spaces.  Firstly, some characterizations for   the boundedness of these operators are given.
Mostafa Hassanlou   +3 more
doaj   +1 more source

Volterra integral operators on a family of Dirichlet-Morrey spaces [PDF]

open access: yesOpuscula Mathematica, 2023
A family of Dirichlet-Morrey spaces \(\mathcal{D}_{\lambda,K}\) of functions analytic in the open unit disk \(\mathbb{D}\) are defined in this paper. We completely characterize the boundedness of the Volterra integral operators \(T_g\), \(I_g\) and the ...
Lian Hu, Xiaosong Liu
doaj   +1 more source

ESSENTIAL NORM OF THE PULL BACK OPERATOR

open access: diamondKorean Journal of Mathematics, 2016
Summary: We obtain some estimations of the essential norm of a pull back operator induced by quasi-symmetric homeomorphisms. As a corollary, we deduce the compactness criterion of this operator.
Shuan Tang, Chong Wu
openalex   +4 more sources

On essential norm of the Neumann operator [PDF]

open access: bronzeMathematica Bohemica, 1992
The author gives an estimate of the essential norm of the Neumann operator. It is shown that under a deformation of the domain investigated by a diffeomorphism, which is conformal on a precisely specified part of the boundary, for the given norm there exists a norm on the space of continuous functions on the boundary of the deformated domain such that ...
Dagmar Medková
openalex   +2 more sources

The essential norm of multiplication operators on $L_p(μ)$ [PDF]

open access: green, 2022
We show that the formula for the essential norm of a multiplication operator on $L_p$, for ...
J. Voigt
openalex   +3 more sources

On the compactness and the essential norm of operators defined by infinite tridiagonal matrices

open access: yesConcrete Operators, 2023
In this article, all sequences u{\boldsymbol{u}}, v{\boldsymbol{v}}, and w{\boldsymbol{w}} that define continuous and compact tridiagonal operators Tu,v,w{T}_{u,v,w} acting on the weighted sequence space lβ2{l}_{\beta }^{2} were characterized ...
Caicedo Alexander   +2 more
doaj   +1 more source

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