# A self-adjoint decomposition of radial momentum implies that Dirac's introduction of the operator is insightful

@article{Liu2014ASD, title={A self-adjoint decomposition of radial momentum implies that Dirac's introduction of the operator is insightful}, author={Q. H. Liu and S. F. Xiao}, journal={arXiv: Quantum Physics}, year={2014} }

With acceptance of the Dirac's observation that the \textit{canonical quantization entails using Cartesian coordinates, }we examine the\textit{\ }% operator $\mathbf{e}_{r}P_{r}$ rather than $P_{r}$ itself and demonstrate that there is a decomposition of $\mathbf{e}_{r}P_{r}$ into two self-adjoint but non-commutative parts, in which one is the total momentum and another is the transverse one. This study renders the operator $P_{r}$ indirectly measurable and physically meaningful.

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