A fixed point approach to the stability of quadratic functional equation with involution

Cadariu and Radu applied the fixed point method to the investigation of Cauchy and Jensen functional equations. In this paper, we will adopt the idea of Cadariu and Radu to prove the Hyers-Ulam-Rassias stability of the quadratic functional equation with involution. Copyright (c) 2008 S.-M. Jung and Z.-H. Lee. 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.