Stability of the Quadratic Equation of Pexider Type
Authors:
Soon-Mo Jung
Affiliation:
(1) Mathematics Section, College of Science & Technology, Hong-Ik University, 339-701 Chochiwon, Korea
Abstract:
We will investigate the stability problem of the quadratic equation (1) and extend the results of Borelli and Forti, Czerwik, and Rassias. By applying this result and an improved theorem of the author, we will also prove the stability of the quadratic functional equation of Pexider type,f1 (x +y) + f2(x -y) =f3(x) +f4(y), for a large class of functions.