On the Superstability of a Generalization of the Cosine Equation
D. Zeglami, S. Kabbaj & A. Roukbi · Journal of Advances in Mathematics and Computer Science · 2013
The aim of this paper is to investigate the stability problem for the functional equation: ƒ(xy)+ƒ(xσ(y))=2g(x)ƒ(y), x,y∈G (Eg,ƒ) and the superstability of the d'Alembert's equation: ...
Open access
Research Article
10.9734/BJMCS/2014/6548