tailieunhanh - Báo cáo hóa học: " Research Article Superstability for Generalized Module Left Derivations and Generalized Module Derivations on a Banach Module (I)"

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 Superstability for Generalized Module Left Derivations and Generalized Module Derivations on a Banach Module (I) | Hindawi Publishing Corporation Journal of Inequalities and Applications Volume 2009 Article ID 718020 10 pages doi 2009 718020 Research Article Superstability for Generalized Module Left Derivations and Generalized Module Derivations on a Banach Module I Huai-Xin Cao 1 Ji-Rong Lv 1 and J. M. Rassias2 1 College of Mathematics and Information Science Shaanxi Normal University Xi an 710062 China 2 Pedagogical Department Section of Mathematics and Informatics National and Capodistrian University of Athens Athens 15342 Greece Correspondence should be addressed to Huai-Xin Cao caohx@ Received 23 January 2009 Revised 2 March 2009 Accepted 3 July 2009 Recommended by Jozsef Szabados We discuss the superstability of generalized module left derivations and generalized module derivations on a Banach module. Let A be a Banach algebra and X a Banach A-module f X X and g A A. The mappings A1 . A2. . A3 . and At are defined and it is g pp g f g f g f g f g proved that if Afg x y z w ỊỊ resp. II Af g x y z w a p is dominated by p x y z w then f is a generalized resp. linear module-A left derivation and g is a resp. linear module-X left derivation. It is also shown that if II Af g x y z w ỊỊ resp. II Af g x y z w a fl ỊỊ is dominated by p x y z w then f is a generalized resp. linear module-A derivation and g is a resp. linear module-X derivation. Copyright 2009 Huai-Xin Cao 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 The study of stability problems had been formulated by Ulam in 1 during a talk in 1940 under what condition does there exist a homomorphism near an approximate homomorphism In the following year 1941 Hyers in 2 has answered affirmatively the question of Ulam for Banach spaces which states that if e 0 and f X Y is a map with X a normed space Y a Banach space such .

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