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Open Access

Superstability of Some Pexider-Type Functional Equation

Journal of Inequalities and Applications20102010:985348

Received: 27 August 2010

Accepted: 19 October 2010

Published: 20 October 2010


We will investigate the superstability of the sine functional equation from the following Pexider-type functional equation ( ), which can be considered the mixed functional equation of the sine and cosine functions, the mixed functional equation of the hyperbolic sine and hyperbolic cosine functions, and the exponential-type functional equations.


Functional EquationFull ArticleCosine FunctionPublisher NoteHyperbolic Sine

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Authors’ Affiliations

Department of Mathematics, Kangnam University, Yongin, Republic of Korea


© Gwang Hui Kim. 2010

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.