On an alternative Cauchy equation.
Il metodo del punto fisso per la classe di equazioni funzionali
A classic fixed-point Theorem enables us to give conditions for the existence and the uniqueness of continuous solutions of the functional equation .
Conditional function equations and orthogonal additivity.
A characterization of some classes of functions F of the form F(x, y) = g(...f(x) + ßf(y) + ...) or F(x, y) = ...(h(x) + k(y)).
Teoremi di regolarità per una classe di equazioni funzionali
A system on functional equations related to plurality functions. A method for the construction of the solutions. (Summary).
On an alternative Cauchy equation in two unknown functions. Some classes of solutions.
A system of functional equations related to plurality functions. A method for the construction of the solutions.
Holomorphic solutions of an inhomogeneous Cauchy equation.
Cauchy's functional equation on semigroups
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