21.4 For further reading

21.4 For further reading

This is a standard topic in all quantum mechanics books. For example, see chapters 12 and 13 of [81]. The so(4) calculation is not in [81], but is in some of the other such textbooks, a good example is chapter 7 of [5]. For extensive discussion of the symmetries of the $\frac{1}{r}$ potential problem, see [38] or [39].

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Appendix: conventions and notation

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