#### arivero

Gold Member

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Old quantum postulate was E= h w, where w= 2 pi/ t. Nowadays, we start from the (afaik) equivalent postulate [x,p]=ih. I suposse this was originated by Dirac-Poisson methodology.

One wonders, Which are the merits and disadvantages of each postulate? For instance, the old one seems more physical, but I have never seen a quantum field theory formulated from the old principle. Also, it is very intriguing to see how to fit both postulates into the path integral formulation.

One wonders, Which are the merits and disadvantages of each postulate? For instance, the old one seems more physical, but I have never seen a quantum field theory formulated from the old principle. Also, it is very intriguing to see how to fit both postulates into the path integral formulation.

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