Quantum spin manifests intrinsic angular momentum from "summary" of The Principles of Quantum Mechanics by P. A. M. Dirac
In quantum mechanics, the concept of spin arises as a natural consequence of the wave equation for an electron. This wave equation, known as the Dirac equation, predicts the existence of particles with intrinsic angular momentum, which we call spin. Quantum spin is a fundamental property of particles, much like mass or charge. It is not related to the particle's actual spinning motion, but rather represents an intrinsic angular momentum that cannot be explained by classical physics. When we say that quantum spin manifests intrinsic angular momentum, what we mean is that particles with spin exhibit properties similar to those of objects in classical mechanics that possess angular m...
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