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Re: Multiple sum excluding some terms


Hi,

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

Sum[(1 - KroneckerDelta[i, j])m[i, j], {j, 1, 3}, {i, 1, 2}]

Regards
  Jens

Guillermo Sanchez wrote:
> 
> 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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