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referframe

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## Main Question or Discussion Point

The QM phase of a single particle traveling freely in 3 dimensions is (

Is this "coincidence" related to relativistic QM?

Thanks in advance.

**r**•**p**– Et), where**r**and**p**are the 3-D position and momentum vectors. This is also the dot product of the space-time four-vector (**r**,-t) with the Energy-Momentum four-vector (**p**,E)Is this "coincidence" related to relativistic QM?

Thanks in advance.

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