ON THE STABILITY OF A GENERALIZED CUBIC FUNCTIONAL EQUATION

• Koh, Hee-Jeong (DEPARTMENT OF MATHEMATICS EDUCATION COLLEGE OF EDUCATION DANKOOK UNIVERSITY) ;
• Kang, Dong-Seung (DEPARTMENT OF MATHEMATICS EDUCATION COLLEGE OF EDUCATION DANKOOK UNIVERSITY)
• Published : 2008.11.30

Abstract

In this paper, we obtain the general solution of a generalized cubic functional equation, the Hyers-Ulam-Rassias stability, and the stability by using the alternative fixed point for a generalized cubic functional equation $$4f(\sum_{j=1}^{n-1}\;x_j\;+\;mx_n)\;+\;4f(\sum_{j=1}^{n-1}\;x_j+mx_n\;x_j\;-\;mx_n}\;+\;m^2\sum_{j=1}^{n-1}\;(f(2x_j)\;=\;8f(\sum_{j=1}^{n-1}\;x_j)\;+\;4m^2{\sum_{j=1}^{n-1}}\;$f(x_j+x_n)\;+\;f(x_j-x_n)$$$ for a positive integer $m\;{\geq}\;1$.

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