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Re: Multiple sum excluding some terms


I have realized that this function works fine

Sum[If[j == i, 0, m[j, i]], {j, 1, 3}, {i, 1, 2}]

guillerm at aida.usal.es (Guillermo Sanchez) wrote in message news:<bn5dpi$6aa$1 at smc.vnet.net>...
> Hi friends
> 
> How make a multiple sum (example: Sum[m[i, j], {j, 1, 3}, {i, 1, 2}])
> excluding terms i = j?
> 
> Guillermo Sanchez


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