The Von Neumann entropy: A reply to Shenker

Shenker has claimed that Von Neumann's argument for identifying the quantum mechanical entropy with the Von Neumann entropy, S() = – ktr( log ), is invalid. Her claim rests on a misunderstanding of the idea of a quantum mechanical pure state. I demonstrate this, and provide a further explanation of Von Neumann's argument.
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DOI 10.1093/bjps/54.2.291
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Simon Friederich (2011). How to Spell Out the Epistemic Conception of Quantum States. Studies in History and Philosophy of Science Part B 42 (3):149-157.
Peter M. Ainsworth (2007). Untangling Entanglement. Foundations of Physics 37 (1):144-158.

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