How does this transition work?

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metalhead
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Hi there
I have been stumped by this (probably simple) math transition in the attached file. Can someone please explain it in full detail?
Big thanks http://postimage.org/image/11vseawf8/"

<< edit by berkeman to post the explicit URL >>

http://postimage.org/image/11vseawf8
 
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I think you forgot to attach a file :smile:
 
You mean, explain what they did? as in they allowed i to take the values 0, 1, and 2 and explicitly wrote the terms of the summation?
 

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