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  • $\begingroup$ @NickStrehlke, glad I could help. $\endgroup$ Commented May 27, 2013 at 5:21
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    $\begingroup$ What if f[i,j] diverges when i=j? Imagine f[i,j]=M[i,j]^(-a), where M[i,j] is a matrix with M[i,j]=0 if i=j, and a is a positive integer number. @RunnyKine $\endgroup$ Commented May 5, 2015 at 16:15
  • $\begingroup$ @RunnyKine Do you know how to do double summation with conditions. mathematica.stackexchange.com/questions/250873/… $\endgroup$ Commented Jul 12, 2021 at 5:30