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So as nobody viewing this question even had a try, I guess I shall answer my own question. The trick lies in observing the result for a specific $n$, e.g. $n=3$, and then rotating the indices: $$[x_3 …
answered Dec 13 '16 by wilsonw
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I have been trying to follow the solution to the Dirac equation for the hydrogen atom. There is a claim from an online source that the following two operators anticommute: $$K=\gamma_4 (\vec\Sigma \c …
asked Dec 11 '16 by wilsonw