Re: Series holding the final sum
- To: mathgroup at smc.vnet.net
- Subject: [mg117761] Re: Series holding the final sum
- From: "Harvey P. Dale" <hpd1 at nyu.edu>
- Date: Thu, 31 Mar 2011 03:58:40 -0500 (EST)
Select[-CoefficientList[ss,x],#!=0&] Best, Harvey -----Original Message----- From: Jon Joseph [mailto:josco.jon at gmail.com] Sent: Wednesday, March 30, 2011 5:10 AM To: mathgroup at smc.vnet.net Subject: [mg117761] [mg117703] Series holding the final sum All: Given the following sum: Sum[(-1)^(n + 2) x^(2 n + 1)/(2 n + 1), {n, 0, 5}] which generates: x - x^3/3 + x^5/5 - x^7/7 + x^9/9 - x^11/11 I would like to replace x with -1 (%/.x->-1) without the sum being evaluated so I end up with -1+1/3-1/5+1/7-1/9+1/11 So far I have not been able to find a way to Hold, HoldForm, Unevaluate, or Defer and keep getting -2578/3465. Thanks. Jon ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________