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The stability of d'Alembert and Jensen type functional equations |
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| Authors: | Gwang Hui Kim |
| Affiliation: | Department of Mathematics, Kangnam University, Suwon 449-702, Republic of Korea |
| Abstract: | The aim of this paper is to study the stability problem of the d'Alembert type and Jensen type functional equations: f(x+y)+f(x+σy)=2g(x)f(y), |
| Keywords: | d'Alembert functional equation Jensen functional equation Cosine function Superstability Hyers-Ulam stability |
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