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NOTES ON THE SUPERSTABILITY OF D'ALEMBERT TYPE FUNCTIONAL EQUATIONS
In this paper we will investigate the superstability of the generalized d'Alembert type functional equations <TEX>${\sum}^m_{i=1}f(x+{{\sigma}^i}(y))$</TEX> = kg(x)f(y) and <TEX>${\sum}^m_{i=1}f(x+{{\sigma}^i}(y))$</TEX> = kf(x)g(y).