In quantum mechanics, the eigenvalue q {\displaystyle q} of an observable O {\displaystyle O} is said to be a good quantum number if the observable O {\displaystyle O} is a constant of motion. In other words, the quantum number is good if the corresponding observable commutes with the Hamiltonian.
In quantum mechanics, the eigenvalue q {\displaystyle q} of an observable O {\displaystyle O} is said to be a good quantum number if the observable O {\displaystyle O} is a constant of motion. In other words, the quantum number is good if the corresponding observable commutes with the Hamiltonian.
Source: Wikipedia "Good quantum number" · CC BY-SA 4.0
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