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Skipping Elements in Sum

• To: mathgroup at smc.vnet.net
• Subject: [mg61080] Skipping Elements in Sum
• From: qcadesigner at gmail.com
• Date: Sun, 9 Oct 2005 01:36:20 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Does anyone know how to skip elements using the mathematica sum? e.g.
take the sum of all i, where i not equal to j.