May 30th, 2013, 05:36 PM  #1 
Newbie Joined: May 2013 Posts: 3 Thanks: 0  zeta function
Hello, can someone help me with prooving this: All what I did is, that I write it as a dobule sum but I don't know what next. :/ Thanks in advance. 
May 31st, 2013, 12:22 AM  #2 
Senior Member Joined: Aug 2011 Posts: 334 Thanks: 8  Re: zeta function
Hi ! invert the order of two sums 
May 31st, 2013, 02:04 AM  #3 
Newbie Joined: May 2013 Posts: 3 Thanks: 0  Re: zeta function
Hello thanks for your answer, I have a couple of more question. I thought about it, but am I allowed to invert these two sums because they are not finite? and even if I am what happened with 1 in the brackets? and what's more I got this: and this is not good because when n=1 there is a 0 in the denominator Am I doing something wrong? Thanks. 
May 31st, 2013, 11:36 PM  #4 
Senior Member Joined: Aug 2011 Posts: 334 Thanks: 8  Re: zeta function
You missed something. Look carefully at the important first step in the attachement to my preceding post.

June 1st, 2013, 06:10 AM  #5 
Newbie Joined: May 2013 Posts: 3 Thanks: 0  Re: zeta function
Aha, ok I got it now, thanks for your help. 

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