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Abstract
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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How to Spell Out the Epistemic Conception of Quantum States.Simon Friederich - 2011 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 42 (3):149-157.
Quantum Decoherence and the Approach to Equilibrium.Meir Hemmo & Orly Shenker - 2003 - Philosophy of Science 70 (2):330-358.

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