MathGroup Archive 2005

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  • 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.

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