On the oddly pervasive notion of the conservation of energypic.twitter.com/j0iWw1sbTY
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More like pervasive notion of action principle + symmetry, right?
Not really. It's possible to get QM from an action principle, but it's pretty artificial (and rarely done, it's quite poorly known).
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Hmm. That was Feynman's PhD thesis. https://cds.cern.ch/record/101498/files/Thesis-1942-Feynman.pdf … Or are you referring to Schwinger’s formulation?
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I'm not referring to Feynman's sum-over-paths formulation (which every physicist knows). I mean a way of formulating Schroedinger's equation as an entirely classical equation of motion on a classical phase space. Sum-over-paths is something entirely different.
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