Stabilities of Cubic Mappings in Various Normed Spaces: Direct and Fixed Point Methods
In 1940 and 1964, Ulam proposed the general problem: “When is it true that by changing a little the hypotheses of a theorem one can still assert that the thesis of the theorem remains true or approximately true?”. In 1941, Hyers solved this stability problem for linear mappings. According to Gruber...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | Journal of Applied Mathematics |
| Online Access: | http://dx.doi.org/10.1155/2012/546819 |
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| author | H. Azadi Kenary H. Rezaei S. Talebzadeh S. Jin Lee |
| author_facet | H. Azadi Kenary H. Rezaei S. Talebzadeh S. Jin Lee |
| author_sort | H. Azadi Kenary |
| collection | DOAJ |
| description | In 1940 and 1964, Ulam proposed the general problem: “When is it true that by changing a little the hypotheses of a theorem one can still assert that the thesis of the theorem remains true or approximately true?”. In 1941, Hyers solved this stability problem for linear mappings. According to Gruber (1978) this kind of stability problems are of the particular interest in probability theory and in the case of functional equations of different types. In 1981, Skof was the first author to solve the Ulam problem for quadratic mappings. In 1982–2011, J. M. Rassias solved the above Ulam problem for linear and nonlinear mappings and established analogous stability problems even on restricted domains. The purpose of this paper is the generalized Hyers-Ulam stability for the following cubic functional equation: 𝑓(𝑚𝑥+𝑦)+𝑓(𝑚𝑥−𝑦)=𝑚𝑓(𝑥+𝑦)+𝑚𝑓(𝑥−𝑦)+2(𝑚3−𝑚)𝑓(𝑥),𝑚≥2 in various normed spaces. |
| format | Article |
| id | doaj-art-0a98a5c1bfea4926bbbabddeb06a2e77 |
| institution | Kabale University |
| issn | 1110-757X 1687-0042 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Applied Mathematics |
| spelling | doaj-art-0a98a5c1bfea4926bbbabddeb06a2e772025-02-03T01:09:27ZengWileyJournal of Applied Mathematics1110-757X1687-00422012-01-01201210.1155/2012/546819546819Stabilities of Cubic Mappings in Various Normed Spaces: Direct and Fixed Point MethodsH. Azadi Kenary0H. Rezaei1S. Talebzadeh2S. Jin Lee3Department of Mathematics, College of Sciences, Yasouj University, Yasouj 75914-353, IranDepartment of Mathematics, College of Sciences, Yasouj University, Yasouj 75914-353, IranDepartment of Mathematics, Islamic Azad University, Firoozabad Branch, Firoozabad, IranDepartment of Mathematics, Daejin University, Kyeonggi 487-711, Republic of KoreaIn 1940 and 1964, Ulam proposed the general problem: “When is it true that by changing a little the hypotheses of a theorem one can still assert that the thesis of the theorem remains true or approximately true?”. In 1941, Hyers solved this stability problem for linear mappings. According to Gruber (1978) this kind of stability problems are of the particular interest in probability theory and in the case of functional equations of different types. In 1981, Skof was the first author to solve the Ulam problem for quadratic mappings. In 1982–2011, J. M. Rassias solved the above Ulam problem for linear and nonlinear mappings and established analogous stability problems even on restricted domains. The purpose of this paper is the generalized Hyers-Ulam stability for the following cubic functional equation: 𝑓(𝑚𝑥+𝑦)+𝑓(𝑚𝑥−𝑦)=𝑚𝑓(𝑥+𝑦)+𝑚𝑓(𝑥−𝑦)+2(𝑚3−𝑚)𝑓(𝑥),𝑚≥2 in various normed spaces.http://dx.doi.org/10.1155/2012/546819 |
| spellingShingle | H. Azadi Kenary H. Rezaei S. Talebzadeh S. Jin Lee Stabilities of Cubic Mappings in Various Normed Spaces: Direct and Fixed Point Methods Journal of Applied Mathematics |
| title | Stabilities of Cubic Mappings in Various Normed Spaces: Direct and Fixed Point Methods |
| title_full | Stabilities of Cubic Mappings in Various Normed Spaces: Direct and Fixed Point Methods |
| title_fullStr | Stabilities of Cubic Mappings in Various Normed Spaces: Direct and Fixed Point Methods |
| title_full_unstemmed | Stabilities of Cubic Mappings in Various Normed Spaces: Direct and Fixed Point Methods |
| title_short | Stabilities of Cubic Mappings in Various Normed Spaces: Direct and Fixed Point Methods |
| title_sort | stabilities of cubic mappings in various normed spaces direct and fixed point methods |
| url | http://dx.doi.org/10.1155/2012/546819 |
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