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The British Journal for the Philosophy of Science 2003 54(2):291-296; doi:10.1093/bjps/54.2.291
© 2003 by British Society for the Philosophy of Science
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The Von Neumann Entropy: A Reply to Shenker

Leah Henderson1

1 Department of History and Philosophy of Science, P.O. Box 80.000, 3508 TA Utrecht, The Netherlands. l.hendersonnz{at}yahoo.com

Shenker has claimed that Von Neumann's argument for identifying the quantum mechanical entropy with the Von Neumann entropy, S({rho}) = – ktr({rho} log {rho}), 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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