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Sum

• To: mathgroup at smc.vnet.net
• Subject: [mg55175] Sum
• From: mjumbo <mjumbo at nm.ru>
• Date: Wed, 16 Mar 2005 05:35:51 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

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.
__________
www.newmail.ru -- Íîâàÿ Ïî÷òà: âñå ïî-íîâîìó.

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