Abstract
Every multiplicative [Formula: see text]-derivation of an alternative algebra [Formula: see text] is additive if there exists an idempotent [Formula: see text] in [Formula: see text] satisfying the following conditions: (i) [Formula: see text] implies [Formula: see text]; (ii) [Formula: see text] implies [Formula: see text]; (iii) [Formula: see text] implies [Formula: see text] for [Formula: see text]. In particular, every [Formula: see text]-derivation of a prime alternative algebra with a nontrivial idempotent is additive. This generalizes the known result obtained by Rodrigues, Guzzo and Ferreira for [Formula: see text]-derivations. As an application, we apply multiplicative [Formula: see text]-derivation to an alternative complex algebra [Formula: see text] of all [Formula: see text] complex matrices to see how it decomposes into a sum of [Formula: see text]-inner derivation and a [Formula: see text]-derivation on [Formula: see text] given by an additive derivation [Formula: see text] on [Formula: see text].
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