Stability of a mixed type additive and quadratic functional equation in non-Archimedean spaces
In this paper, we establish generalized Hyres-Ulam-Rassias stability of the mixed type additive and quadratic functional equation f(3x + y) + f(3x - y) = f(x + y) + f(x - y) + 2f(3x) - 2f(x) in non-Archimedean spaces.
stability quadratic functional equation non-archimedean space additive functional equation