Advances in Difference Equations

, 2009:503724 | Cite as

On the Superstability Related with the Trigonometric Functional Equation

  • Gwang Hui Kim
Open Access
Research Article


We will investigate the superstability of the (hyperbolic) trigonometric functional equation from the following functional equations: Open image in new window , Open image in new window , Open image in new window , Open image in new window , which can be considered the mixed functional equations of the sine function and cosine function, of the hyperbolic sine function and hyperbolic cosine function, and of the exponential functions, respectively.


Differential Equation Partial Differential Equation Ordinary Differential Equation Functional Analysis Functional Equation 
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Copyright information

© Gwang Hui Kim. 2009

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.

Authors and Affiliations

  1. 1.Department of MathematicsKangnam UniversityYounginSouth Korea

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