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: Dirac Delta in polar coordinates

  1. Jul 8, 2010 #1
    1. The problem statement, all variables and given/known data

    Hi, I would like to know what is the right way to write continous deltas standing in a circle of radius a?

    2. Relevant equations

    3. The attempt at a solution

    I am not sure weather it's δ(r-a) or is it
    Thank you
  2. jcsd
  3. Jul 8, 2010 #2


    User Avatar
    Homework Helper

    You know that:
    f(x,y)=\int_{-\infty}^{\infty}f(u,v)\delta (x-u)\delta (y-v)dxdy
    Now make a change of co-ordinates from Cartesian to polar, and the answer should drop out for you. Failing that look it up on Wikipedia :eek:)

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook