tailieunhanh - Báo cáo hóa học: " Research Article Stability of the Cauchy-Jense"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Stability of the Cauchy-Jense | Hindawi Publishing Corporation Fixed Point Theory and Applications Volume 2008 Article ID 872190 11 pages doi 2008 872190 Research Article Stability of the Cauchy-Jensen Functional Equation in C -Algebras A Fixed Point Approach Choonkil Park1 and Jong Su An2 1 Department of Mathematics Hanyang University Seoul 133-791 South Korea 2 Department of Mathematics Education Pusan National University Pusan 609-735 South Korea Correspondence should be addressed to Jong Su An jsan63@ Received 3 April 2008 Accepted 14 May 2008 Recommended by AndrzejSzulkin we prove the Hyers-Ulam-Rassias stability of C -algebra homomorphisms and of generalized derivations on C -algebras for the following Cauchy-Jensen functional equation 2 x y 2 z f x f y 2f z which was introduced and investigated by Baak 2006 . The concept of Hyers-Ulam-Rassias stability originated from the stability theorem of Th. M. Rassias that appeared in 1978 . Copyright 2008 C. Park and J. S. An. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction and preliminaries The stability problem of functional equations originated from a question of Ulam 1 concerning the stability of group homomorphisms. Hyers 2 gave a first affirmative partial answer to the question of Ulam for Banach spaces. Hyers theorem was generalized by Aoki 3 for additive mappings and by Rassias 4 for linear mappings by considering an unbounded Cauchy difference. Theorem see 4 . Let f E E be a mapping from a normed vector space E into a Banach space E subject to the inequality Ilf x y - f x - f y II e x p y p for all x y G E where e and p are constants with e 0 and p 1. Then the limit L x lim l n tt 2n 2 Fixed Point Theory and Applications exists for all x G E and L E Er is the unique additive mapping which satisfies 2ẽ f x - L x 2-2P x p for all x

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