>> I'm stuck about one "simple" problem
>> I have to keep the "b^2-1" from decomposition to
>> "(b-1)*(b+1)" and don't know how to reach this. Is there a
>> way to keep the form like
>> "b^2-1" or (b+1)^2 from expansion?
>
>I don't understand the question. Maxima will only factor (b^2-1) into
>(b-1)*(b+1) if you explicitly call 'factor'. Could you give some more
>context for the question, and perhaps an example?
Sorry for the english.
"factor" is one of the main tool for simplification. In my program I use
functions "factorsum" and "factorfacsum" from facexp package.
These functions gives the final result in acceptable form exept that
they factors forms like b^2-1 to (b-1)*(b+1)". Is there a way to avoid this?
Valery