1. Sep 8, 2012 #1

   coolbeans777

   

   I didn't put this in any of the physics sections, because I'm only learning this as it pertains to complex analysis. This was just an example provided in a free complex analysis textbook. Basically what I'm asking is why for the law of gravitation, f = GMm/r(t)^2, and it equals the equation in the picture when described by complex functions.
   
   http://i.minus.com/iblXBR9aafGTaZ.png [Broken]

    

   Last edited by a moderator: May 6, 2017

   coolbeans777, Sep 8, 2012
2. 
   Phys.org - latest science and technology news stories on Phys.org

   • • Game over? Computer beats human champ in ancient Chinese game
   • • Simplifying solar cells with a new mix of materials
   • • Imaged 'jets' reveal cerium's post-shock inner strength
3. Sep 8, 2012 #2

   Mute

   

   Homework Helper

   It looks to me like they're just using the complex function z(t) = x(t) + iy(t) in place of a vector function r(t) = (x(t),y(t)). Since the only information you really care about is x(t) and y(t), the two representations will give you the same results.

    

   Mute, Sep 8, 2012
4. Sep 8, 2012 #3

   HallsofIvy

   

   Staff Emeritus

   Science Advisor

   Yes. This only uses the fact that the complex plane has two real dimensions. It has nothing to do with the algebraic properties that distinguish the complex plane from R²

    

   HallsofIvy, Sep 8, 2012

• Log in with Facebook
• Log in with Twitter

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in