1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Putting a discrete sum of cosines in closed form

  1. Apr 12, 2010 #1
    1. The problem statement, all variables and given/known data

    I've just found what I think is the Green's function for a source between two ideal conducting planes at x = 0 and x = l:


    2. Relevant equations

    [tex]
    G(x,x') = \Sigma \frac{icos(\pi n x/l)}{(\pi n /l)}
    [/tex]


    3. The attempt at a solution

    The question then wants me to put this in a closed form but I can't really see any useful identities to do this. Any hints/thoughts?? (perhaps my Green's function is wrong :yuck:

    ohh..... the summation is from - infinity to infinity... and I must say that it was troubling me that I'll have a singularity in my summation at n=0.
     
    Last edited: Apr 12, 2010
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted