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Multiple sum excluding some terms

• To: mathgroup at smc.vnet.net
• Subject: [mg44089] Multiple sum excluding some terms
• From: guillerm at aida.usal.es (Guillermo Sanchez)
• Date: Wed, 22 Oct 2003 03:24:45 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hi friends

How make a multiple sum (example: Sum[m[i, j], {j, 1, 3}, {i, 1, 2}])
excluding terms i = j?

Guillermo Sanchez