ISSN : 1226-0657
In this paper, we obtain the general solution and the generalized HyersUlam stability theorem for an additive functional equation <TEX>$af(x+y)+2f({\frac{x}{2}}+y)+2f(x+{\frac{y}{2})=(a+3)[f(x)+f(y)]$</TEX>for any fixed integer a.
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