Let A be a subgroup of a commutative group (G, +) and P be a quadratically closed field. We give the full description of all pairs of functions f : G → P and g : A → P such that f(x + y) + f(x − y) = 2f(x)g(y) for (x, y) ∈ G × A.
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Department of Mathematics, Faculty of Sciences, University Ibn Zohr, AgadirDepartment of Mathematics, Faculty of Sciences, University Ibn Zohr, Agadir
Redouani A.
Elqorachi E.
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Department of Mathematics, Faculty of Sciences, University Ibn Zohr, AgadirDepartment of Mathematics, Faculty of Sciences, University Ibn Zohr, Agadir
Elqorachi E.
Rassias T.M.
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Department of Mathematics, National Technical University of Athens, Zografou CampusDepartment of Mathematics, Faculty of Sciences, University Ibn Zohr, Agadir