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David Bowman wrote:
We start with Hamilton's principle. This essentially means we
have a Lagrangian formulation of the situation.
I guess this statement illuminates the crux of my problem. When
you say that, at the start, you "have a Lagrangian formulation of
the situation", are you saying that you already know
1) the details of the Lagrangian for a particular problem, or
2) that the general definition of the Lagrangian is L = KE - PE,
or
3) something else?
IE.; At the start, what is our a priori knowledge/definition of
the Lagrangian?
Bob Sciamanda