Random832 comments on [SEQ RERUN] Collapse Postulates - Less Wrong

2 Post author: MinibearRex 30 April 2012 06:49AM

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Comment author: Random832 30 April 2012 12:31:54PM 0 points [-]

The only phenomenon in all of physics that violates Liouville's Theorem (has a many-to-one mapping from initial conditions to outcomes).

I don't know what Liouville's Theorem is, but this sounds like an objection to not being able to run time backwards.

Comment author: Oscar_Cunningham 30 April 2012 01:05:00PM 2 points [-]

Liouville's Theorem says that if you know that the state of the universe has to be one of the states in a set A, and then as time passes you run each universe in that set forwards, so that now you know that the universe is in set A', then the "volume" of sets A and A' has to be the same.