Wave functions and their exp(-ipx) are base of quantum mechanics and QFT. But how to derive them the most simply that we will understand why they are base of QM?(adsbygoogle = window.adsbygoogle || []).push({});

It is interesting that Feynman in his book "QED: The Strange Theory of Light and Matter" very simplifies QED, but he did not give a reason how this exp(-ipx) (or sin(px)) arises.

It is also interesting that his amplitudes succesively multiplies, but paralelly they suming. But one of the simplest form of multiplicaton function is exp(i..) function. Has this any deeper meaning?

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# Arising of exp(-ipx) in QM in quantum field theory

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