On the hyperstability of a quartic functional equation in Banach spaces
Author
Bounader, Nordine
Full text
https://www.revistaproyecciones.cl/index.php/proyecciones/article/view/139610.4067/S0716-09172017000100003
Abstract
In this paper, we establish some hyperstability results of the following functional equationf (2x + y) + f (2x - y) = 4(f (x + y) + f (x - y)) + 24f (x) - 6f (y)in Banach spaces.