Stability of the Jensen-Type Functional Equation in C∗-Algebras: A Fixed Point Approach

Using fixed point methods, we prove the generalized Hyers-Ulam stability of homomorphisms in C∗-algebras and Lie C∗-algebras and also of derivations on C∗-algebras and Lie C∗-algebras for the Jensen-type functional equation f((x+y)/2)+f((x−y)/2)=f(x).

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Main Authors: Choonkil Park, John Michael Rassias
Format: Article
Language:English
Published: Wiley 2009-01-01
Series:Abstract and Applied Analysis
Online Access:http://dx.doi.org/10.1155/2009/360432
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author Choonkil Park
John Michael Rassias
author_facet Choonkil Park
John Michael Rassias
author_sort Choonkil Park
collection DOAJ
description Using fixed point methods, we prove the generalized Hyers-Ulam stability of homomorphisms in C∗-algebras and Lie C∗-algebras and also of derivations on C∗-algebras and Lie C∗-algebras for the Jensen-type functional equation f((x+y)/2)+f((x−y)/2)=f(x).
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spelling doaj-art-da9977426480460ebf59d7a7d239187f2025-08-20T02:21:16ZengWileyAbstract and Applied Analysis1085-33751687-04092009-01-01200910.1155/2009/360432360432Stability of the Jensen-Type Functional Equation in C∗-Algebras: A Fixed Point ApproachChoonkil Park0John Michael Rassias1Department of Mathematics, Hanyang University, Seoul 133-791, South KoreaPedagogical Department E.E., National and Capodistrian University of Athens, 4 Agamemnonos Street, Aghia Paraskevi, Athens 15342, GreeceUsing fixed point methods, we prove the generalized Hyers-Ulam stability of homomorphisms in C∗-algebras and Lie C∗-algebras and also of derivations on C∗-algebras and Lie C∗-algebras for the Jensen-type functional equation f((x+y)/2)+f((x−y)/2)=f(x).http://dx.doi.org/10.1155/2009/360432
spellingShingle Choonkil Park
John Michael Rassias
Stability of the Jensen-Type Functional Equation in C∗-Algebras: A Fixed Point Approach
Abstract and Applied Analysis
title Stability of the Jensen-Type Functional Equation in C∗-Algebras: A Fixed Point Approach
title_full Stability of the Jensen-Type Functional Equation in C∗-Algebras: A Fixed Point Approach
title_fullStr Stability of the Jensen-Type Functional Equation in C∗-Algebras: A Fixed Point Approach
title_full_unstemmed Stability of the Jensen-Type Functional Equation in C∗-Algebras: A Fixed Point Approach
title_short Stability of the Jensen-Type Functional Equation in C∗-Algebras: A Fixed Point Approach
title_sort stability of the jensen type functional equation in c∗ algebras a fixed point approach
url http://dx.doi.org/10.1155/2009/360432
work_keys_str_mv AT choonkilpark stabilityofthejensentypefunctionalequationincalgebrasafixedpointapproach
AT johnmichaelrassias stabilityofthejensentypefunctionalequationincalgebrasafixedpointapproach