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" ... The first rule both works empirically, and is remarkably clear. The second rule also works empirically, but it contains all the interpretative difficulties collected together under the name “the measurement problem”. (For example: What exactly is “a measurement”? Since measurement apparatus is made of a bunch of interacting atoms, so mustn't it be ultimately a modellable by QM? How is the rule to be applied then? How does the system “know” to behave differently in the presence of measurement equipment rather than anything else?) ... "