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SUPERSTABILITY OF FUNCTIONAL INEQUALITIES ASSOCIATED WITH GENERAL EXPONENTIAL FUNCTIONS

  • Received : 2009.09.01
  • Published : 2010.12.25

Abstract

We prove the superstability of a functional inequality associated with general exponential functions as follows; ${\mid}f(x+y)-a^{x^2y+xy^2}g(x)f(y){\mid}{\leq}H_p(x,y)$. It is a generalization of the superstability theorem for the exponential functional equation proved by Baker.

Keywords

References

  1. J. Baker, The stability of the cosine equations, Proc. Amer. Math. Soc. 80 (1980), 411-416. https://doi.org/10.1090/S0002-9939-1980-0580995-3
  2. J. Baker, J. Lawrence And F. Zorzitto, The stability of the equations, f(x+y)=f(y), Proc. Amer. Math. Soc. 74 (1979), 242-246.
  3. G. L. Forti, Hyers-Ulam stability of functional equations, in several variables, Aequationes Math. 50 (1995), 146-190. https://doi.org/10.1007/BF01831117
  4. R. Ger, Superstability is not natural, Rocznik Naukowo-Dydaktyczny WSP Krakkowie, Prace Mat. 159 (1993), 109-123.
  5. D.H. Hyers, On the stabliity of the linear functional equations, Proc. Nat. Acad. Sci. U. S. A. 27 (1941), 222-224. https://doi.org/10.1073/pnas.27.4.222
  6. D.H. Hyers and Th.M. Rassias, Approximate homomorphisms, Aequatioues Math. 44 (1992), 125-153. https://doi.org/10.1007/BF01830975
  7. D.H. Hyers, G. Isac, and Th.M. Rassias, Stability of Stability of functional equations in Seeral variabler, Birkhauser-Basel-Berlin(1998).
  8. K.W. Jun, G,H. Kim and Y.W. Lee, Stability of generalized gamma and beta functional equations, Aequation Math. 60(2000), 15-24. https://doi.org/10.1007/s000100050132
  9. S.-M. Jung, On the gerneral Hyers-Ulam stability of gamma functional equation, Bull. Korean Marth. Sec. 34. No 3 (1997), 437-446.
  10. S.-M. Juug. On the stability of the gammer functional equations, Results Math. 33 (1998), 306-309. https://doi.org/10.1007/BF03322090
  11. G.H. Kim, and Y.W. Lee, The stability of the beta functional equation, Babes-Bolyai Mathematica, XLA (1)(2000), 89-96.
  12. Y.W. Lee, On the stability of a quadratic Jensen type functional equations, J. Math. Anal. Appl. 270 (2002) 590-601. https://doi.org/10.1016/S0022-247X(02)00093-8
  13. Y.W. Lee, The stability of derivations on Banach algebras, Bull. Institute of Math. Academia Sinica, 28 (2000), 113-116.
  14. Y.W. Lee and B..M. Choi, The stability of Cauchy's gamma-beta functional equation, J. Math. Anal. Appl. 299 (2004), 305-313. https://doi.org/10.1016/j.jmaa.2003.12.050
  15. Th.M. Rassias, On the stability of the linear mapping in Banach spaces, Proc. Amer. Math. Soc. 72 (1978), 297-300. https://doi.org/10.1090/S0002-9939-1978-0507327-1
  16. Th.M. Rassias, On a problem of S. M. Ulam and the asymptotic stabilityl of the Cauchy functional equation with applications, General Inequalities 7. MFO. Oberwolfach. Birkhauser Verlag. Basel ISNM Vol 123 (1997), 297-309.
  17. Th.M. Rassias, On the stability of the quadratic functional equation and its applications, Studia. Univ. Babes-Bolyai XLIII (3). (1998), 89-124.
  18. Th.M. Rassias, The problem of S. M. Ulam for approximately multiplication mappings, J. Math. Anal. Appl. 246 (2000), 352-378. https://doi.org/10.1006/jmaa.2000.6788
  19. Th.M. Rassias, On the stability of functional equations in Banach spaces, J. Math. Anal. Appl. 251 (2000), 264-284. https://doi.org/10.1006/jmaa.2000.7046
  20. Th.M. Rassias, On the stability of functional equations and a problem of Ulam, Acta Applications. Math. 62 (2000), 23-130. https://doi.org/10.1023/A:1006499223572
  21. Th.M. Rassias and P. Semrl, On the behavior of mapping that do not stability Hyers-Ulam stability, Proc. Amer. Math. soc. 114 (1992), 989-993. https://doi.org/10.1090/S0002-9939-1992-1059634-1
  22. S.M. Ulam, Problems in Modern Mathematics, Proc. Chap. VI. Wiley. NewYork, 1964.

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