On 3/22/2014 10:52 AM, John Clark wrote:
"I'm saying that in classical physics a state can produce only one future state, but any given state can have been produced in more than one way,
This is only true if you equivocate on "state". If "state" means microstate of a closed system (in either classical or quantum physics without collapse) then a state can produce only one future state. So the first clause would be true. And since the evolution equations are reversible it can come from only one prior state. For the second clause above to be true, "state" must be interpreted as a macrostate. But for a macrostate, the first clause is false since a macrostate can evolve into different future states, even different macrostates (c.f. Poincare return).
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