Prove that given two angular momenta l and s their sum j l
Prove that, given two angular momenta, L and S, their sum J = L+ S satisfies the commutation relations of the angular momentum (and therefore has the all the general properties of an angular momentum, e.g., the ladder structure, etc.).
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prove that given two angular momenta l and s their sum j l s satisfies the commutation relations of the angular
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