Stability Of a Quadratic Functional Equation in Intuitionistic Fuzzy Banach Spaces

Hyers-Ulam-Rassias stability theorem has been applied to several functional equations for studying stability in case  of approximation of a given functional equation in Banach spaces,  fuzzy Banach spaces etc. In this paper, we wish to study generalized Hyers-Ulam-Rassias stability regarding the approximation of the following quadratic functional equation f (2 x + y ) − f ( x + 2 y ) = 3 f ( x ) − 3 f ( y ) (1) in intuitionistic fuzzy Banach spaces.