2024 : 4 : 30
Hoger Ghahramani

Hoger Ghahramani

Academic rank: Professor
ORCID:
Education: PhD.
ScopusId: 26032003000
Faculty: Faculty of Science
Address: Department of Mathematics, University of Kurdistan, Sanandaj, Iran. P. O. Bix. 416
Phone:

Research

Title
Ternary derivations of nest algebras
Type
JournalPaper
Keywords
Nest algebra, ternary (inner) derivation.
Year
2021
Journal Operators and Matrices
DOI
Researchers Ajda Fosner ، Hoger Ghahramani

Abstract

‎Suppose that $ \mathcal{X} $ is a (real or complex) Banach space‎, ‎$dim \mathcal{X} \geq 2$‎, ‎and $\mathcal{N}$ is a nest on $\mathcal{X}$‎, ‎with each $N \in \mathcal{N}$ is complemented in $\mathcal{X}$ whenever $N_{-}=N$‎. ‎A ternary derivation of $\al$ is a triple of linear maps $(\gamma‎, ‎\delta‎, ‎\tau)$ of $\al$ such that $\gamma(AB)=\delta(A)B+A\tau(B)$ for all $A,B\in \al$‎. ‎We show that for linear maps $\delta‎, ‎\tau$ on $\al$ there exists a unique linear map $\gamma:\al \rightarrow \al$ defined by $\gamma(A)=RA+AT$ for some $R,T \in \al$ such that $(\gamma‎, ‎\delta‎, ‎\tau)$ is a ternary derivation of $\al$ if and only if $\delta‎ , ‎\tau$ satisfy $\delta(A)B+A\tau(B)=0$ for any $A,B\in \al$ with $AB=0$‎. ‎We also prove that every ternary derivation on $\al$ is an inner ternary derivation‎. ‎Our results are applied to characterize the (right or left) centralizers and derivations through zero products‎, ‎local right (left) centralizers‎, ‎right (left) ideal preserving maps and local derivations on nest algebras‎.