The Principle of Stationary Action (sometimes called Principle of Least Action and other names) is successfully applied in a wide variety of fields in physics. It can often can be be used to derive basic equations of the respective field. For example, in classical mechanics, electrodynamics, thermodynamics, general relativity, quantum mechanics, and quantum field theory. Is there any deeper explanation for the validity of this miraculous principle in such a diverse number of areas in physics?
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