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Ludwig_Hus
Posts:
3
From:
Brazil
Registered:
12/12/14


Double summation with index constraits
Posted:
Dec 12, 2014 6:55 AM


Hello,
How do I evaluate the following double summation: $$ \sum_{t=0}\infty \sum_{j=0}^{2t} f(t,j,r) $$ where r is positive integer. I want to sum up only the terms in which r+j are even values. So, there will be two cases: 1) r=2m and 2) r=2m+1, for m=0,1,2...
How to change conveniently the indexes?
Thanks.



