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In physics, the semiclassical approximation divides a system into two parts, one to be described quantum-mechanically, and the other to be treated classically. In general, it incorporates a series expansion in powers of Planck's constant, resulting in classical physics in the power of 0, and the first nontrivial approximation to the power of (-1). In this case, there is a clear link between the quantum-mechanical system and the associated semiclassical and classical

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