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comment Why does Principle for least action hold for classical fields
@Qmechanic The question I'm asking here is very different from those two questions. I'm not asking why motion of a particle follows the principle of least action, which comes from the Newton's laws. My question is for classical field theory like EM and gravitational field. One obvious answer is Newton's gravity law and Maxwell eqns imply the the principle of least action. But the fact that both of these field theories satisfy the least action principle, does that mean there is something deeper going around? Is it the particular of these laws which frorce them to satisfy the least action.
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comment Does every hermitian operator represent a measurable quantity?
What is the precise definition of the term observable? How do you know a hermitian operator is observable or not?
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