APPROXIMATIONS OF SYSTEM OF COMPOSITE TYPE ADDITIVE FUNCTIONAL EQUATIONS IN BANACH SPACES AND GZN

Abstract

n this study, we examine the existence, uniqueness, and stability of a system of additive functional equations of composite type in GZN and Banach spaces. The Alternative fixed-point theorem is used to show that the answer is unique. By adapting certain sufficient conditions, we achieve stability results for the Hyers-Ulam-Rassias (HUR) type.