Academic Editor: Patricia J. Y. Wong
Copyright © 2009 Abbas Najati and Choonkil Park. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Using the fixed point method, we prove the generalized Hyers-Ulam
stability of the generalized quadratic functional equation
modules, where are nonzero rational numbers with .