Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Analytic functions

  1. Mar 28, 2013 #1
    find an analytic function F where F' = f

    f(z) = z-2
    f(z) = ((z^4) +1)/(z^2)
    f(z) = sinzcosz

    I know I have to put these into the cauchy riemann equations but I dont know what to use for my du/dx or du/dy because im not sure to use x-2 for my du/dx etc or if im supposed to integrate first. I dont know which parts of the equations fit into the riemann-cauchy equations. My book only gives one example and I dont know how to relate these, please help
  2. jcsd
  3. Mar 28, 2013 #2
    Just integrate like in calculus?
  4. Mar 28, 2013 #3


    User Avatar
    Science Advisor

    All these expressions can be handled by ordinary integration (the second one is more difficult).
    For example f(z) = z-2, them F(z) = z2/2 - 2z + C.
  5. Apr 2, 2013 #4


    User Avatar
    Science Advisor

    The second function is not entire , so you need to specify a domain. Depending on the level of your class, it would be nice to have an argument for why the antiderivative is analytic (hint, use something like independence of path and Morera's thm.)
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook