Jordan *-homomorphisms on $C^{\ast }$-algebras

Abstract

In this paper, we investigate Jordan *-homomorphisms on $C^{\ast }$-algebras associated with the following functional inequality $\Vert f(\frac{b-a}{3})+f(\frac{a-3c}{3})+f(\frac{3a+3c-b}{3})\Vert \le \Vert f(a)\Vert .$ We moreover prove the superstability and the generalized Hyers-Ulam stability of Jordan *-homomorphisms on $C^{\ast }$-algebras associated with the following functional equation $$f(\frac{b-a}{3})+f(\frac{a-3c}{3})+f(\frac{3a+3c-b}{3})=f(a).$$