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Hyers–Ulam–Rassias stability
The stability problem of functional equations originated from a question of Stanisław Ulam, posed in 1940, concerning the stability of group homomorphisms. In the next year, Donald H. Hyers〔D. H. Hyers, (''On the stability of the linear functional Equation'' ), Proc. Natl. Acad. Sci. USA, 27(1941), 222-224.〕 gave a partial affirmative answer to the question of Ulam in the context of Banach spaces in the case of ''additive'' mappings, that was the first significant breakthrough and a step toward more solutions in this area. Since then, a large number of papers have been published in connection with various generalizations of Ulam’s problem and Hyers’s theorem. In 1978, Themistocles M. Rassias〔Th. M. Rassias, (''On the stability of the linear mapping in Banach spaces'' ), Proc. Amer. Math. Soc. 72(1978), 297–300.〕 succeeded in extending Hyers’s theorem for mappings between Banach spaces by considering an unbounded Cauchy difference〔D. H. Hyers, G. Isac and Th. M. Rassias, (''Stability of Functional Equations in Several Variables'' ), Birkhäuser Verlag, Boston, Basel, Berlin, 1998.〕 subject to a continuity condition upon the mapping. He was the first to prove the stability of the ''linear mapping''. This result of Rassias attracted several mathematicians worldwide who began to be stimulated to investigate the stability problems of functional equations.
By regarding a large influence of S. M. Ulam, D. H. Hyers, and Th. M. Rassias on the study of stability problems of functional equations, the stability phenomenon proved by Th. M. Rassias led to the development of what is now known as Hyers–Ulam–Rassias stability〔''Hyers-Ulam-Rassias stability'', in: Encyclopaedia of Mathematics, Supplement III, M. Hazewinkel (ed.), Kluwer Academic Publishers, Dordrecht, 2001, pp.194-196.〕 of functional equations. In 1950, T. Aoki〔T. Aoki, (''On the stability of the linear transformation in Banach spaces'' ), J. Math. Soc. Japan, 2(1950), 64-66.〕 considered an unbounded Cauchy difference which was generalised later by Rassias to the linear case. This result is known as Hyers–Ulam–Aoki stability of the additive mapping.〔L. Maligranda, A result of Tosio Aoki about a generalization of Hyers-Ulam stability of additive functions–a question of priority, Aequationes Math. 75 (2008), 289-296.〕 Aoki (1950) had not considered continuity upon the mapping, whereas Rassias (1978) imposed extra continuity hypothesis which yielded a formally stronger conclusion. For an extensive presentation of the stability of functional equations in the context of Ulam's problem, the interested reader is referred to the recent book of S.-M. Jung,〔S.-M. Jung, ''Hyers-Ulam-Rassias Stability of Functional Equations in Nonlinear Analysis'', Springer, New York (2011) ISBN 978-1-4419-9636-7.〕 published by Springer, New York, 2011, as well as to the following papers.〔S.-M. Jung, ''Hyers-Ulam-Rassias stability of Jensen's equation and its application'', Proc. Amer. Math. Soc. 126(1998), 3137-3143.〕〔S.-M. Jung, ''On the Hyers-Ulam-Rassias stability of a quadratic functional equation'', J. Math. Anal. Appl. 232(1999), 384-393.〕〔G.-H. Kim, ''A generalization of Hyers-Ulam-Rassias stability of the G-functional equation'', Math. Inequal. Appl. 10(2007), 351-358.〕〔Y.-H. Lee and K.-W. Jun, ''A generalization of the Hyers-Ulam-Rassias stability of the pexider equation'', J. Math. Anal. Appl. 246(2000), 627-638.〕
== References ==
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