TAILIEUCHUNG - Báo cáo hóa học: " Research Article On the Stability of a New Pexider-Type Functional Equation"

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 On the Stability of a New Pexider-Type Functional Equation | Hindawi Publishing Corporation Journal of Inequalities and Applications Volume 2008 Article ID 816963 22 pages doi 2008 816963 Research Article On the Stability of a New Pexider-Type Functional Equation Kil-Woung Jun 1 2 Yang-Hi Lee 3 and Juri Lee2 1 National Institute for Mathematical Sciences Daejeon 305-340 South Korea 2 Department of Mathematics Chungnam National University Daejeon 305-764 South Korea 3 Department of Mathematics Education Gongju National University of Education Gongju 314-711 South Korea Correspondence should be addressed to Yang-Hi Lee yanghi2@ Received 1 October 2007 Accepted 31 January 2008 Recommended by Patricia Wong We establish the generalized Hyers-Ulam stability of a Pexider-type functonal equation ffx y z f2 x - y f3 x - z - f4 x - y - z - f5 x y - f6 x z 0 which is mixed of a quadratic and an additive functional equations. Also we obtain its general solution from the stability results. Copyright 2008 Kil-Woung Jun et al. 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 In 1940 Ulam 1 raised the following question. Under what conditions does there exist an additive mapping near an approximately additive mapping In 1941 Hyers 2 proved that if f V X is a mapping satisfying f x y - f x - f y Ô L1 for all x y G V where V and X are Banach spaces and Ỗ is a given positive number then there exists a unique additive mapping T V X such that Ilf x - T x Ô for all x G V .In 1978 Rassias 3 gave a significant generalization of Hyers result. Rassias 4 during the 27th International Symposium on Functional Equations that took place in Bielsko-Biala Poland in 1990 asked the question whether such a theorem can also be proved for a more general setting. Gadja 5 following Rassias s approach 3 gave an affirmative solution to the question. Recently Gdvruta 6

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