-----maxima-bounces at math.utexas.edu wrote: ----- >bonjour? >factor((a-b)^10001?+?(b-a)^10001)??---->??0? >jean? Thanks--I didn't think about factor. But (%i5) factor((a-b)^10001 + (b-a)^10001 + 1); Maxima encountered a Lisp error: --Barton