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Give some Lagrangian we use the principle of stationary action to find the desired euqations of motion for something (e.g. a field).

A lot of modern physics seems to be based on the principle of stationary action. I read it works for classical mechanics, general relativity, Quantum chromodynamics, quantum electrodynamics, weak interactions and more stuff.

However, is there a field where the principle of stationary action does not yield the desired result or where it fails (contradicts some experimental result)?

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marked as duplicate by Qmechanic May 28 '15 at 12:40

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