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) ...

Abstract. We prove the Cauchy–Rassias stability of linear n -inner product preserving mappings

in n -inner product Banach spaces. We apply the Cauchy-Rassias inequality that plays an

influencial role in the ...