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Topic: Double summation with index constraits
Replies: 1   Last Post: Dec 23, 2014 7:40 AM

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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
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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.



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