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2022/100/3-4 (10) — DOI: 10.5486/PMD.2022.9170 — pp. 427-434

On a functional equation related to generalized inner derivations

Authors: Irena Kosi-Ulbl and Joso Vukman

Abstract:

The purpose of this paper is to prove the following result. Let $X$ be a real or complex Banach space, let $ \mathcal{L}(X)$ be the algebra of all bounded linear operators on $X$, and let $\mathcal{A}(X)\subseteq\mathcal{L}(X)$ be a standard operator algebra, which posses the identity operator. Suppose there exists a linear mapping $F:\mathcal{A}(X)\rightarrow\mathcal{L}(X)$ satisfying the relation $F(A^{n})=F(A^{n-1})A-AF(A^{n-2})A+AF(A^{n-1})$ for all $A\in\mathcal{A}(X)$ and some fixed integer $n\geq3$. In this case, $F$ is of the form $F(A)=AB_{1}+B_{2}A$ for all $A\in\mathcal{A}(X)$ and some fixed $B_{1},B_{2}\in\mathcal{L}(X)$. In particular, $F$ is continuous.

Keywords: prime ring, semiprime ring, Banach space, standard operator algebra, derivation, Jordan derivation, Jordan triple derivation, inner derivation, generalized inner derivation, functional equation

Mathematics Subject Classification: 16W25, 39B52, 47B01