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luckyluke193 t1_j4xl1v7 wrote

Reply to comment by Speterius in Why does the existence of magnetic monopoles imply quantized electric charges? by Speterius

> Is the fact that angular momentum must be quantized a postulate of QM or is it derived from something more fundamental?

Quantisation of angular momentum follows from the mathematical definitions of wave functions and operators in QM. Specifically, it comes from the structure of the group of rotations in 3D, SO(3). In the end, this is Lie group and Lie algebra representation theory.

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