The ε-Hyperstability of an Euler-Lagrange Type Quadratic Functional Equation in Banach Spaces
Mohamed Sirouni & Samir Kabbaj · Journal of Advances in Mathematics and Computer Science · 2015
The main goal of this paper is the investigation of the ε-hyperstability of an Euler-Lagrange type quadratic functional equation f(x + y) +1/2[f(x - y) + f(y - x)] = 2f(y) + 2f(x) in the class of functions from an abelian group into a Banach space.
Open access
Research Article
10.9734/BJMCS/2015/14474