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In this paper , using the fixed point alternative approach , we investigate the Hyers Ulam-Rassias stability of the quadratic functional equation ) ( 2 ) ( 2 ) ( ) ( y f x f y x f y x f + = − + + in Menger probabilistic normed spaces.

Fixed Point And Hyers-ulam-rassias Stability Of A Quadratic Functional Equation In Menger Probabilistic Normed Spaces