The most fundamental principle in physics is called 'The Principle of Least Action'. It also happens to be a good principle to live by during these trying times
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but you can say the same about equations, in the sense that all of physics can be ultimately expressed as equations. the principle of "equations". in fact, it is even more general because there are equations that cannot be derived from the extremization of an action
no,in physics you climb the ladder of deduction until you arrive at a point where you cannot make predictions until you make at least one measurement .. you can *think* about them as axioms, but at the end of the day the fact that nature obeys the principle of least action is 1/2
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an empirical fact
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