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I'm still puzzled by Loschmidt's paradox.
In quantum mechanics, an isolated system has a unitarian time-evolution which implies that the (von-Neumann-) entropy remains constant at all times. (Contrary to the entropy-increase due to mixing in isolated classical systems for example)
So whenever the entropy of a system increases there must be other systems or an environment present to compensate this increase. For example, the entropy of the whole universe should not be allowed to increase.
Any Thoughts?
In quantum mechanics, an isolated system has a unitarian time-evolution which implies that the (von-Neumann-) entropy remains constant at all times. (Contrary to the entropy-increase due to mixing in isolated classical systems for example)
So whenever the entropy of a system increases there must be other systems or an environment present to compensate this increase. For example, the entropy of the whole universe should not be allowed to increase.
Any Thoughts?
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