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## Main Question or Discussion Point

In non-relativistic quantum mechanics time evolution is given by the usual [tex]e^{\frac{-i\hat{H}t}{\hbar}}[/tex] (for non time dependent hamiltonians). How does one time evolve a quantum system in the context of relativity, where time and space have been placed on equal footing? We clearly cannot use the above expression since it is a result of the schrodinger equation which is not relativistically invariant.....help?

Phil :!!)

Phil :!!)