JOURNAL OF COMPUTATIONAL ANALYSIS AND APPLICATIONS, v. 22, no. 7, page. 1189-1197
Abstract
In this paper, we solve the following quadratic rho-functional inequalities N (f(x + y) + f (x - y) - 2f (x) - 2f(y) - rho(2f (x + y/2) + 2f (x- y/2) - f(x) - f(y),t) >= t/t + phi(x, y), (0.1) where rho is a fixed real number with rho not equal 1/2. Using the direct method, we prove the Hyers-Ulam stability of the quadratic rho-functional inequalities (0.1) and (0.2) in fuzzy Banach spaces.