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Kyungpook Mathematical Journal
Article . 2009 . Peer-reviewed
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On the Generalized Hyers-Ulam-Rassias Stability of Higher Ring Derivations

On the generalized Hyers-Ulam-Rassias stability of higher ring derivations
Authors: Park, Kyoo-Hong; Jung, Yong-Soo;

On the Generalized Hyers-Ulam-Rassias Stability of Higher Ring Derivations

Abstract

Let \({\mathcal A}\), \({\mathcal B}\) be real or complex algebras. A sequence \(H=\{h_0,h_1,\dots\}\) of additive operators from \({\mathcal A}\) to \({\mathcal B}\) is called a \textit{higher ring derivation} if \[ h_n(zw)=\sum_{i=0}^{n}h_i(z)h_{n-i}(w),\qquad z,w\in{\mathcal A}, n=0,1,\dots. \] A sequence \(F=\{f_0,f_1,\dots\}\) of operators from \({\mathcal A}\) to \({\mathcal B}\) is called a \textit{higher derivation} if \[ f_n(x+y+zw)=f_n(x)+f_n(y)+\sum_{i=0}^{n}f_i(z)f_{n-i}(w),\qquad x,y,z,w\in{\mathcal A}, n=0,1,\dots. \] The main goal of the paper is to consider approximate higher derivations and the problem of the stability of higher ring derivations. It is shown, in particular, that if a sequence \(F=\{f_0,f_1,\dots\}\) satisfies, with some given control mappings \(\varphi_n:{\mathcal A}^4\to[0,\infty)\), \[ \|f_n(x+y+zw)-f_n(x)-f_n(y)-\sum_{i=0}^{n}f_i(z)f_{n-i}(w)\|\leq\varphi_n(x,y,z,w) \] for all \(x,y,z,w\in {\mathcal A}\) and \(n=0,1,\dots\), then there exists a unique higher ring derivation \(H=\{h_0,h_1,\dots\}\) such that \(h_n\) is somehow \textit{close} to \(f_n\) for each \(n\). Several corollaries are obtained for particular control mappings \(\varphi_n\) and under some additional assumptions upon \({\mathcal A}\). The results refer in particular to \textit{D. G. Bourgin} [Duke Math. J. 16, 385--397 (1949; Zbl 0033.37702)], \textit{R. Badora} [Math. Inequal. Appl. 9, No.~1, 167--173 (2006; Zbl 1093.39024)], \textit{T. Miura}, \textit{G. Hirasawa} and \textit{S.-E. Takahasi} [J. Math. Anal. Appl. 319, No.~2, 552--530 (2006; Zbl 1104.39025)].

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Keywords

Banach algebra, Stability, separation, extension, and related topics for functional equations, Functional equations for functions with more general domains and/or ranges, Hyers-Ulam-Rassias stability, higher ring derivation

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
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