MathGroup Archive 2004

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Conditonal sum

I am new to mathematica and could really need a tip on how to implement a 
conditional sum.  Pseudocode would be something like this

if j in Sm:

I have tried doing this by using an If-clause inside the sum-function, but  

this seems little elegant and is nor very suitable for symbolic calculations.

Any advice would be highly appreciated

Christopher Grinde

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