There are many [tex]n[/tex]'s in QM, and I am confused as to which is which. For example, there are:(adsbygoogle = window.adsbygoogle || []).push({});

- [tex]n[/tex] called principal quantum number
- [tex]n_r=n-l-1[/tex] (anonymous n)
- [tex]n_i[/tex] in [tex]E=({3\over2}+n_x+n_y+n_z)[/tex] and [tex]n=\sum_i n_i[/tex]
- [tex]n[/tex] the indices of energy as in [tex]E_n[/tex]
- and lots more

Could anyone kindly help me distinguish them? Some of them take on values including 0 while others don't. Very confusing!

Thanks

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# N's in Quantum Mechanics

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