I am to show that the following is true:

I understand that for it's equal to , but how to I get zero for ?

Also note that are integers

Thanks for the help!

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- November 7th 2011, 10:26 AMkornellsterSum equal to Kronecker delta - how?
I am to show that the following is true:

I understand that for it's equal to , but how to I get zero for ?

Also note that are integers

Thanks for the help! - November 7th 2011, 01:33 PMemakarovRe: Sum equal to Kronecker delta - how?
This is a geometric progression, so use the formula .