Hi, I have a question related to the orbital angular momentum.(adsbygoogle = window.adsbygoogle || []).push({});

In the referring to Arfken & Weber Mathematical Methods for physicists-6th edition page 267,

"In the relativistic Dirac equation, orbital angular momentum is no longer conserved, but J=L+S is conserved,"

Here, I want to know why orbital angular momentum isn't conserved in relativistic Dirac equation.

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# Orbital angular momentum problem

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