Services & Resources / Wolfram Forums
MathGroup Archive
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2005

[Date Index] [Thread Index] [Author Index]

Search the Archive


  • To: mathgroup at
  • Subject: [mg55175] Sum
  • From: mjumbo <mjumbo at>
  • Date: Wed, 16 Mar 2005 05:35:51 -0500 (EST)
  • Sender: owner-wri-mathgroup at

Can sombody explain me why

Sum[Exp[- k], {k, 0, Infinity}]

gives the correct result, while the following (imho equivalent) statements

x = Exp[-k]
Sum[x, {k, 0, Infinity}]

don't? What should I do to make it work? It is rather vexing to copy/paste long expressions instead of using short placeholders like x.
__________ -- Íîâàÿ Ïî÷òà: âñå ïî-íîâîìó.

  • Follow-Ups:
    • Re: Re: Sum
      • From: yehuda ben-shimol <>
    • Re: Sum
      • From: DrBob <>
    • Re: Sum
      • From: Sseziwa Mukasa <>
  • Prev by Date: bug in series expansion routines.
  • Next by Date: numerical, bessel
  • Previous by thread: Re: bug in series expansion routines.
  • Next by thread: Re: Sum