Good quantum number

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When an inherent state of a certain physical quantity becomes the steady state in quantum mechanics at the same time (when, in other words, it is hamiltonian and commutation), it is said with the quantum number that is good in eigenvalue of the physical quantity.

Example

• Full size momentum of the electronic system in the atom
• Spin angular momentum when I assumed LS coupling, orbit angular momentum

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This article is taken from the Japanese Wikipedia Good quantum number

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