Zobrazeno 1 - 10
of 751
pro vyhledávání: '"essential norm"'
Publikováno v:
Demonstratio Mathematica, Vol 57, Iss 1, Pp 201-312 (2024)
We calculate the essential norm of bounded diagonal infinite matrices acting on Köthe sequence spaces. As a consequence of our result, we obtain a recent criteria for the compactness of multiplication operator acting on Köthe sequence spaces.
Externí odkaz:
https://doaj.org/article/2cd50787324b4c8496d362ec740dc697
Autor:
Guo Zhitao
Publikováno v:
Demonstratio Mathematica, Vol 56, Iss 1, Pp 110-145 (2023)
The aim of this study is to investigate the boundedness, essential norm, and compactness of generalized Stević-Sharma operator from the minimal Möbius invariant space into Bloch-type space.
Externí odkaz:
https://doaj.org/article/7265238b17ca419ca61e8454982845c2
Autor:
Munirah Aljuaid, Mahmoud Ali Bakhit
Publikováno v:
AIMS Mathematics, Vol 8, Iss 10, Pp 23087-23107 (2023)
This research paper sought to characterize the boundedness and compactness of composition operators from the space $ \mathcal{H}^{\infty} $ of bounded harmonic mappings into harmonic Zygmund space $ \mathcal{Z}_H $, on the open unit disk. Furthermore
Externí odkaz:
https://doaj.org/article/f60379762bd64b6e9ced18e72dbdcf3a
Autor:
Lian Hu, Xiaosong Liu
Publikováno v:
Opuscula Mathematica, Vol 43, Iss 5, Pp 633-649 (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 t
Externí odkaz:
https://doaj.org/article/857514a0605f4731a21a4d53b4e3b40b
Publikováno v:
Concrete Operators, Vol 10, Iss 1, Pp 297-304 (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. Addit
Externí odkaz:
https://doaj.org/article/8ba332af31ee49d6b30c1e3a9efa6e2b
Autor:
Xiangling Zhu, Qinghua Hu
Publikováno v:
Mathematics, Vol 12, Iss 15, p 2373 (2024)
Let n∈N0, ψ be an analytic self-map on D and u be an analytic function on D. The single operator Du,ψn acting on various spaces of analytic functions has been a subject of investigation for many years. It is defined as (Du,ψnf)(z)=u(z)f(n)(ψ(z)
Externí odkaz:
https://doaj.org/article/c944d7f846ab4c0490693095bc053599
Publikováno v:
Sahand Communications in Mathematical Analysis, Vol 20, Iss 3, Pp 69-80 (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. Then some estimates of the essen
Externí odkaz:
https://doaj.org/article/2a03dca6cd3d4523b691ab741a7c769d
Autor:
Schep Anton R.
Publikováno v:
Concrete Operators, Vol 10, Iss 1, Pp 109-122 (2023)
Let EE be a complex Banach lattice and TT is an operator in the center Z(E)={T:∣T∣≤λIfor someλ}Z\left(E)=\left\{T:| T| \le \lambda I\hspace{0.33em}\hspace{0.1em}\text{for some}\hspace{0.1em}\hspace{0.33em}\lambda \right\} of EE. Then, the ess
Externí odkaz:
https://doaj.org/article/ca5de26246f94f5b9c3a893fe8fcd0e4