The simplification a^b * a^c --> a^(b+c) is built into the general simplifier.
I know of no way to prevent Maxima from doing this simplification.
What exactly were you trying to do?
--Barton
-----maxima-bounces at math.utexas.edu wrote: -----
>Can?I?put?the?the?attribute?to?the?operator"^"?
>
>?
>
>Example:?
>
>a^(b+c)?-->a^b*a^c
>
>?
>
>kill(all)$
>(%i1)?declare(["^",exp],additive);
>?????????a^(b+c);
>?????????exp(b+c);
>
>(%o1)?done
>(%o2)?a^(c+b)
>(%o3)?%e^c+%e^b
>????? ???? ????? ??????? ???? ?
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