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

**Follow-Ups**:**Re: simplifying inside sum, Mathematica 5.1***From:*DrBob <drbob@bigfoot.com>

**Re: simplifying inside sum, Mathematica 5.1***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>