When just one talks about “spin” in physics, it’s a Distinctive situation of the final story of angular momentum. Angular momentum is by definition the “infinitesimal generator” in the action of spatial rotations within the theory, equally classically and quantum mechanically. Classically, the perform $q_1p_2-q_2p_1$ is definitely the ingredient $L_3$ https://epictetusk382rdq1.blogdal.com/profile