If an isolated system goes from a state A to B, will it always eventually fluctuate back to state A? If not, give an simple example. Is it right to say that entropy only says that the probability for reversal is very low, but not actually 0, ie that it will take a very long time for some processes to reverse themselves, but they will infact eventually happen with probability 100%?
So will the universe eventually fluctuate back into yesterdays state? Or do we add some other physical law to make it irreversible?
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