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how to make conditional summation

• To: mathgroup at smc.vnet.net
• Subject: [mg55545] how to make conditional summation
• From: "Xiao Jun Jun" <xiaoxun at gmail.com>
• Date: Tue, 29 Mar 2005 03:42:29 -0500 (EST)
• Organization: The Chinese University of Hong Kong
• Sender: owner-wri-mathgroup at wolfram.com

Hi, All,

Say, Sum[f[m],{m,-N,N}] with N != 0
Any suggestions?

Regards.
Xun 

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