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MathGroup Archive 2005

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simplifying inside sum, Mathematica 5.1

  • To: mathgroup at smc.vnet.net
  • Subject: [mg53709] simplifying inside sum, Mathematica 5.1
  • From: Richard Fateman <fateman at cs.berkeley.edu>
  • Date: Mon, 24 Jan 2005 03:37:32 -0500 (EST)
  • Organization: University of California, Berkeley
  • Sender: owner-wri-mathgroup at wolfram.com

Sum[a[i]*x^i,{i,0,Infinity}]

%/. x->0


leaves 0^i  inside the sum, unsimplified.

So does the sum from 1 to Inf.

The correct answers are presumably a[0] and 0.

Is there a way to get Mathematica to do this?

RJF


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