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Homework Help: Laurent Series

  1. Mar 31, 2012 #1
    1. The problem statement, all variables and given/known data

    I have been asked to state the precise nature of the singularities at z=2 and z=-1/3 in t6rtb6.png

    2. Relevant equations

    I know the laurent series is given by vymfz4.png

    3. The attempt at a solution

    I think I need to expand the series out into a laurent series around z=2 and z=-1/3 but I am really stuck on how to do this and would really appreciate a bit of help! From some examples I have seen I need to manipulate the denominator into a known series and then expand this but I am unsure of how to do that. Thanks
  2. jcsd
  3. Mar 31, 2012 #2


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    You don't need to expand anything. You just need to review the definition of a pole of order n.
  4. Mar 31, 2012 #3
    I know I don't have to but I thought that a laurent expansion was another way to find out the nature of a singularity, like what the order of the pole was, and I just wanted to try and get a grasp of this technique as well and get the same answer for both techniques
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