On the stability of J$^*-$derivations

In this paper, we establish the stability and superstability of $J^*-$derivations in $J^*-$algebras for the generalized Jensen--type functional equation $rf(\frac{x+y}{r})+rf(\frac{x-y}{r})= 2f(x).$ Finally, we investigate the stability of $J^*-$derivations by using the fixed point alternative.

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