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I'm new in this area, and I have some trouble understanding the next concepts, I'll be glad if somebody can give a sample definition or some examples of the concept of "Local Lagrangian" and "configuration variables" on sistems with finite-number or freedom degrees. Thanks in advice.

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    $\begingroup$ Local Lagrangian part has duplicate: physics.stackexchange.com/q/95018 $\endgroup$ – user146020 Mar 16 '17 at 19:44
  • $\begingroup$ It's right to say "Local Lagrangian" are the same that "Local Lagrangian Density"? $\endgroup$ – Ragnar1204 Mar 16 '17 at 19:47
  • $\begingroup$ Almost always AFAIK, density is implied. $\endgroup$ – user146020 Mar 16 '17 at 19:49
  • $\begingroup$ Configuration space is explained here: physics.stackexchange.com/q/185612/2451 $\endgroup$ – Qmechanic Mar 16 '17 at 20:05

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