Abstract. Let f denote a mapping from an orthogonality space (X;?) into a real Ba-

nach space Y. In this paper, we prove the Hyers–Ulam stability of the orthogonally cubic

functional equations f(2x+y)+f(2x¡y) ...

lAbstract. We give a fixed point approach to the generalized Hyers-Ulam stability of the

cubic equation

f(2x + y) + f(2x

In this paper, we study solutions of the 2-variable mixed additive and

cubic functional equation

f(2x + y; 2z + t) + f(2x...

We establish some stability results concerning the cubic functional equation

f (2x + y)+ f(2x- y) = 2f(x + y) + 2f(x- y) + 12f(x)

in fuzzy normed spaces. We discuss the fuzzy continuity of the cubic mappings and show...