  Conventional wisdom holds that the von Neumann entropy corresponds to
thermodynamic entropy, but Hemmo and Shenker (2006) have recently argued
against this view by attacking von Neumann (1955) and his argument. I argue
that Hemmo and Shenker's arguments fail due to several misunderstandings: about
statistical-mechanical and thermodynamic domains of applicability, about the
nature of mixed states, and about the role of approximations in physics. As a
result, their arguments fail in all cases: in the single-particle case, the
finite particles case, and the infinite particles case.
