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Baias, Alina Ramona; Popa, Dorian; Rassias, Michael Th
Quaestiones mathematicae, 06/2023, Letnik: 46, Številka: 6Journal Article
In this paper we provide a characterization theorem for set-valued solutions of the functional equation for the case of compact, convex valued maps. We prove that every solution of the functional equation is the sum of an additive single-valued function and a nonempty compact and convex set.
