On additive functions with additional derivation properties

The purpose of this paper is to introduce the notion of a generalized derivation which derivates a prescribed family of smooth vector-valued functions of several variables. The basic calculus rules are established and then a result derived which shows that if a function $f$ satisfies an addition theorem whose determining operation is derivable with respect to an additive function $d$, then the function $f$ is itself derivable with respect to $d$. As an application of this approach, new proof of a generalization of a recent result of Maksa is obtained. We also extend the result of Nishiyama and Horinouchi and formulate two open problems.

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