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For questions involving the Lagrangian formulation of a dynamical system. Namely, the application of an action principle to a suitably chosen Lagrangian or Lagrangian Density in order to obtain the equations of motion of the system.
19
votes
The meaning of action
As a layman, I can't offer too much, but I can offer how I think about action.
$$S=\int L \;\mathrm{d}t$$
The key distinction in classical mechanics between the Hamiltonian and the Lagrangian is tha …