DOI QR코드

DOI QR Code

SUPERSTABILITY OF THE GENERALIZED PEXIDER TYPE EXPONENTIAL EQUATION IN ABELIAN GROUP

  • Received : 2012.03.17
  • Accepted : 2012.06.15
  • Published : 2012.06.30

Abstract

In this paper, we will prove the superstability of the following generalized Pexider type exponential equation $${f(x+y)}^m=g(x)h(y)$$, where $f,g,h\;:\;G{\rightarrow}\mathbb{R}$ are unknown mappings and $m$ is a fixed positive integer. Here G is an Abelian group (G, +), and $\mathbb{R}$ the set of real numbers. Also we will extend the obtained results to the Banach algebra. The obtained results are generalizations of P. G$\check{a}$vruta's result in 1994 and G. H. Kim's results in 2011.

Keywords

References

  1. T. Aoki, On the stability of the linear transformation in Banach spaces, J. Math. Soc. Japan, 2 (1950), 64-66. https://doi.org/10.2969/jmsj/00210064
  2. J. Baker, J. Lawrence and F. Zorzitto, The stability of the equation f(x + y) = f(x)f(y), Proc. Amer. Math. Soc. 74 (1979), 242-246.
  3. D.G. Bourgin, Approximately isometric and multiplicative transformations on continuous function rings, Duke Math. J. 16 (1949), 385-397.
  4. G.L. Forti, Hyers-Ulam stability of functional equations in several variables, Aequationes Math. 50 (1995), 143-190. https://doi.org/10.1007/BF01831117
  5. P. Gavruta, A generalization of the Hyers-Ulam-Rassias stability of approxi- mately additive mapping, J. Math. Anal. Appl. 184 (1994), 431-436. https://doi.org/10.1006/jmaa.1994.1211
  6. P. Gavruta, On the stability of some functional equation, Stability of Mappings of Hyers-Ulam Type, Hardronic Press, Palm Harbor, FL, U.S.A. (1994), 93-98.
  7. D.H. Hyers, On the stability of the linear functional equation, Proc. Nat. Acad. Sci. USA. 27 (1941), 222-224. https://doi.org/10.1073/pnas.27.4.222
  8. G. Kim, Stability of the Lobacevski equation, J. Nonlinear Sci. Appl. 4 (2011), 11-18.
  9. G. Kim, Stability of the Pexiderized Lobacevski equation, J. Appl. Math. 2011 (2011), Article ID 540274.
  10. Zs. Pales, P. Volkmann and R.D. Luce, Hyers-Ulam stability of functional equa- tions with a square-symmetric operation, Proc. Natl. Acad. Sci. USA 95(1998), 12772-12775. https://doi.org/10.1073/pnas.95.22.12772
  11. 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
  12. J.M. Rassias, On the Approximation of Approximately Linear Mappings by Lin- ear Mappings, Journal of Functiopnal Analysis 46 (1982), 126-130. https://doi.org/10.1016/0022-1236(82)90048-9
  13. S.M. Ulam, "Problems in Modern Mathematics" Chap. VI, Science editions, Wiley, New York, (1964).