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Singularity problem

  1. Oct 10, 2008 #1
    why lnZ is not isolated singularity?
     
  2. jcsd
  3. Oct 10, 2008 #2

    Dick

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    Because you can't define ln(z) to be holomorphic in the disk after removing 0. It has multiple branches.
     
  4. Oct 13, 2008 #3
    Questions on Poles

    I am trying to do my homework on:

    Integration form 0 to infinity of [( log x)^4 ]/[1+x^2] dx =

    by first defining what is a branch cut and how it will fit into the above integrand.

    Thanks

    Marie
     
  5. Oct 13, 2008 #4

    Dick

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    Re: Questions on Poles

    I don't recommend posting a brand new question onto an existing thread. Start a new one. While you're doing that figure out how to start the problem so you can post an attempt. Where are the poles?
     
  6. Oct 13, 2008 #5
    How do I start the new threads?

    Thanks
     
  7. Oct 13, 2008 #6
    The poles is x= +/- i
     
  8. Oct 13, 2008 #7

    Dick

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    Go to the Calculus and Beyond forum and under Forum Tools you'll find start new thread.
     
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