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Proving Euler Lagrange equations

  1. Nov 24, 2015 #1
    Hi everybody; I am looking for the deduction of the euler lagrange equations (d/dt)(∂L/∂v)-(∂L/∂x) from the invariance of the action δ∫Ldt=0.
    Can someone please tell me where can I find It?

    Thanks for reading.
  2. jcsd
  3. Nov 24, 2015 #2


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    Last edited: Nov 24, 2015
  4. Nov 24, 2015 #3
    Thanks for the anwser; I was trying to prove this for a covariant lagrangian; the only differencie I spot with your proof is that I have to write √(1-(u/c)^2)dτ instead of dt.
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