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Quantum mechanics describes the microscopic properties of nature in a regime where classical mechanics no longer applies. It explains phenomena such as the wave-particle duality, quantization of energy and the uncertainty principle and is generally used in single body systems. Use the quantum-field-theory tag for the theory of many-body quantum-mechanical systems.

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I can not quickly follow the detailed reasoning in your paper. But, usually, it is possible to use perturbation theory to calculate the derivatives of many quantities in quantum mechanics. The first …
answered Jun 26 '14 by user47505
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Possibly (for this purpose) the simplest expression of the Wigner-Eckhart theorem in plain language is "what else could it be?" The angular motion of the nucleus is described by the spin. The spin o …
answered Aug 8 '14 by user47505