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I am thinking about observables in relativistic quantum mechanics (RQM). The position operator (X) is considered to be an observable in QM vs time, which seems to be just a parameter. What about RQM? Do we have any operator of position like X? or we have just a parameter of space-time? I want to know can we say the observer make a position for observing after each measurement in RQM or we can't?

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