series expansions in two variables problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg39504] series expansions in two variables problem*From*: mc799 at ic.ac.uk (Martin)*Date*: Thu, 20 Feb 2003 05:13:43 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

hi, I'm expanding an expression in two variables (sigma and epsilon, say), but am having trouble persuading Mathematica to chuck away terms of form epsilon*sigma. ie I'm getting A + B*sigma + C*epsilon + D*sigma*epsilon + O(sigma^2) + O(epsilon^2) and I'd like very much to lose the D terms. does anyone have any suggestions? Thanks Martin