Abstract:We explore deeper and analyse in more detail Fermat's and Hamilton's principles. We try to address some questions: Is it possible to have δS negative? Is Hamilton's principle always valid for entire path of the system? Is there a relation between Fermat's principle and Hamilton's principle? We assume analogy with Hamilton's principle, is Fermat's principle always valid for entire path of the system? Does a least action take a least time for happening?
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