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!

What property of lagrangian is used here?

  1. Sep 27, 2012 #1
    Hi, the attached picture shows a derivation of what I can only assume to be the property that the lagrange equations are invariant under a transformation of the coordinates.
    But I have some trouble understanding how you go from the term pointed out the rear of the arrow to the point pointed out by the front of the arrow. Can anyone explain?
     

    Attached Files:

  2. jcsd
  3. Sep 27, 2012 #2

    dextercioby

    User Avatar
    Science Advisor
    Homework Helper

    It's really easy

    [tex] \frac{\partial q^{i}}{\partial \dot{Q}^{j}} = 0 [/tex]

    then he used the equality written on the first line just before the text written (apparently) in some Nordic language.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook