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MathGroup Archive 2003

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Re: series expansions in two variables problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39513] Re: [mg39504] series expansions in two variables problem
  • From: BobHanlon at aol.com
  • Date: Fri, 21 Feb 2003 04:07:29 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

In a message dated 2/20/03 5:56:12 AM, mc799 at ic.ac.uk writes:


> 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?
>

(Series[Exp[x + y], {x, 0, 3}, {y, 0, 3}] //

         Normal // Expand) /.
   x^n_.*y^m_. :> 0



Bob Hanlon



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