Notes on the superstability of d'Alembert type functional equations
Bull. Korean Math. Soc. 2009 Vol. 46, No. 2, 235-243
Printed March 1, 2009
Peng Cao and Bing Xu
Sichuan University
Abstract : In this paper we will investigate the superstability of the generalized d'Alembert type functional equations $\sum_{i=1}^{m}f(x+\sigma^{i}(y))=kg(x)f(y)$ and $\sum_{i=1}^{m}f(x+\sigma^{i}(y))=kf(x)g(y)$.
Keywords : d'Alembert functional equation, superstability, cosine function
MSC numbers : 39B82, 39B32
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