Janyarak Tongsomporn

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The stability of the functional equation F (x + y) − G(x − y) = 2H(x)K(y) over the domain of an abelian group G and the range of the complex field is investigated. Several related results extending a number of previously knownones, such as the ones dealingwith the sine functional equation, the d’Alembert functional equation and Wilson functional equation,(More)
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