How to drop terms in a Lagrangian?

samedi 18 avril 2015

Hi guys,



So textbooks have it that: "Two Lagrangians differing by a total time-derivative of a function of the coordinates are equivalent". I have no idea what that means or how to use it; so I dont know which terms I can drop from Lagrangians, which is a bit of a problem.



For example,...



How to drop terms in a Lagrangian?





How to drop terms in a Lagrangian?

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