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How does this transition work?

  1. Jul 13, 2011 #1
    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/" [Broken]

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

    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Jul 13, 2011 #2
    I think you forgot to attach a file :smile:
  4. Jul 13, 2011 #3
    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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