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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)?


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

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