On the Stability of Quartic Functional Equations via Fixed Point and Direct Method

Abstract

The purpose of this paper is to establish the Hyers-UlamRassias stability of quartic functional equation (3 )

Solution and intuitionistic fuzzy stability of 3-dimensional cubic functional equation: using two different methods

“…Authors [4,9,21] pointed out that a fixed point alternative method can be successfully used to solve the Ulam problem. The fixed point method in the study of the stability of functional equations firstly appears in [12].…”

On the Complete 2-Normed Stabilization of Cubic and Quadratic Functional Equations

“…( Further, the stability of various functional equations was studied on various spaces such as RN-space, IRN-space, Orthogonal Space etc 1,2,3 . This article is divided in to four sections.…”