simplifying operator experessions with Dot, Times and Plus

*To*: mathgroup at smc.vnet.net*Subject*: [mg35481] simplifying operator experessions with Dot, Times and Plus*From*: "JL" <jl at aol.com>*Date*: Tue, 16 Jul 2002 04:49:38 -0400 (EDT)*Organization*: University of Pittsburgh*Sender*: owner-wri-mathgroup at wolfram.com

I am trying to expand a large expression that has terms that look as follows: -ex[0,1].(ex[0,1].ex[1,2]-ex[1,2].ex[0,1]) where ex[i,j] are unevaluated expressions. I would like Mathematica to simplify this and analogous expressions so that they read: ex[0,1].ex[1,2].ex[0,1]-ex[0,1].ex[0,1].ex[1,2] However, I cannot seem to find anything that will work. The problem is that I need to keep track of the order of the expressions ex[i,j]. If Dot were replaced by Times, there would be no problem whatsoever. If anyone knows how to help me with this problem, I would greatly appreciate it. Thanks, Jeremy Levy jlevy at pitt.edu