International Journal of Mathematics and Mathematical Sciences
Volume 2007 (2007), Article ID 13437, 6 pages
doi:10.1155/2007/13437

Hyers-Ulam-Rassias and Ulam-Gavruta-Rassias stabilities of an additive functional equation in several variables

Abstract

It is well known that the concept of Hyers-Ulam-Rassias stability was originated by Th. M. Rassias (1978) and the concept of Ulam-Gavruta-Rassias stability was originated by J. M. Rassias (1982-1989) and by P. Găvruta (1999). In this paper, we give results concerning these two stabilities.