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On the Paper by A. Najati and S.-M. Jung: The Hyers-Ulam Stability of Approximately Quadratic Mapping on Restricted DomainsKeywords: Hyers-Ulam stability , Quadratic functional equation , Quadratic mapping , Approximate quadratic mapping , Asymptotic behavior Abstract: In [32], A. Najati and S.-M. Jung obtained the Hyers-Ulam stability of the generalized quadratic functional equation $f(rx+sy)+rsf(x-y)=rf(x)+sf(y)$ with $r+s=1$, $req0$, $seq0$, provided that $f$ is an even mapping. The purpose of this paper is to remove this restriction.
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