Though we're not discussing entanglement per se, some of these examples surely meet the criteria. So, my thought question for the day: is the method of copying important? Example #1: we start with a single marble, A. Then, we magically create a copy, marble B--perfectly like marble B in every way. . .that is, the atoms are configured similarly, the interaction environment is the same--and they are indistinguishable from one another. Example #2: we start with a single marble A. Then, instead of magically creating a copy, we search the universe, Tegmarkian-style, and locate a second marble, B that is perfectly equivalent to our original marble A. All tests both magically avoid QM decoherence problems and show that our newfound marble is, in fact, indistinguishable in every way from our original. Here's the question: Are the properties of the *relationship* between Marbles A and B in Example #1 perfectly equivalent to those in Example #2? If the criteria involves simply analysis of configurations at a precise point in time, it would seem the answer must be "yes." On the other hand, if the method by which the marbles were created is crucial to the present configuration, then the answer would be "no."

R. Miller

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