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Hoger Ghahramani

Hoger Ghahramani

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

Research

Title
Zero product determined triangular algebras
Type
JournalPaper
Keywords
Zero product determined algebra; Zero Jordan product determined algebra; Zero Lie product determined algebra; Bilinear map; Linear map; Triangular algebra; (block) upper triangular matrix algebra.
Year
2013
Journal LINEAR & MULTILINEAR ALGEBRA
DOI
Researchers Hoger Ghahramani

Abstract

Let $\A$ be an algebra over a commutative unital ring $\C$. We say that $\A$ is zero product determined if for every $\C$-module $\X$ and every $\C$-bilinear map $\phi:\A \times \A \rightarrow \X$ the following holds: if $\phi(A,B)=0$ whenever $AB=0$, then there exists a $\C$-linear map $L$ such that $\phi(A,B)=L(AB)$ for all $A,B\in \A$. If we replace in this definition the ordinary product by the Jordan (resp. Lie) product, then we say that $\A$ is zero Jordan (resp. Lie) product determined. We show that the triangular algebra $\T=\begin{pmatrix} \A & \M \\ 0 & \B \end{pmatrix}$ is zero (resp. Lie) product determined if and only if $\A$ and $\B$ are zero (resp. Lie) product determined, and under some technical restrictions, a same result is true for the Jordan product. The main result is then applied to generalized triangular matrix algebras and (block) upper triangular matrix algebras. In particular we show that: (i) the block upper triangular matrix algebra $B_{n}^{\bar{k}}(\C)$ ($n\geq 1 $) is a zero product determined algebra; (ii) if $\C$ contains the element $\frac{1}{2}$, then $B_{n}^{\bar{k}}(\C)$ ($n\geq 1 $) is a zero Jordan product determined algebra; (iii) if $\A$ is a commutative algebra, then $B_{n}^{\bar{k}}(\A)$ ($n\geq 1 $) is a zero Lie product determined algebra.