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Hyers-Ulam-Rassias stability of a quadratic-additive type functional equation on a restricted domain
, 2013In this paper, we prove Hyers-Ulam-Rassias stability of a functional equation f(x+ y) + f(x− y)− 2f(x)− f(y)− f(−y) = 0 on a restricted domain by using the direct method in the sense of Hyers.
Yang-Hi Lee
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