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Re: [Phys-l] symmetries of the Lagrangian

He doesn't say so explicitly, but I'm guessing JD doesn't have a dog in this fight per se, other than the book reviews he's offered :-). That is, there is much to be said for using the Lagrangian to solve problems, and not get too caught up in the philosophy of first principles of "where it comes from or why it looks like it does." Fair enough.

JD has offered this reference before and I agree that it is interesting and useful. On looking at it again, unless I have missed something, its *entire* relevance to *this* particular thread is a lone statement in Section 1.6: "The key idea is to construct a Lagrangian L such that Lagrange's equations are Newton's equations."

End of story/thread :-)