Abstract
The phrase ‘quantum mechanics on phase space’ [1.14] epitomises the fundamental question of the relationship between quantum mechanics and classical mechanics. The deep structural differences between the two theories make it difficult to see how to justify the common claim that the latter theory emerges as an approximation to the former in circumstances under which Planck’s constant can be regarded as small. On the side of the states one would have to explain why superpositions of (vector) states representing macroscopically distinct properties of large systems are practically never observed. We do not enter into this difficult issue here.
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Further Reading
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(1995). Phase Space. In: Operational Quantum Physics. Lecture Notes in Physics Monographs, vol 31. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-49239-9_6
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DOI: https://doi.org/10.1007/978-3-540-49239-9_6
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