On 2008/4/7, J.C. Pizarro <jcpiza at gmail.com>, i wrote: > If i remove the expression "-z" then it solved in few seconds: > > (%i12) factor(expand((x-y)^1000)); > 1000 > (%o12) (y - x) Look it, Maxima solved it wrongly! It's bug of Maxima! The correct answer is (x-y)^1000, not (y-x)^1000 !!! Sincerely, J.C.Pizarro