PeterDonis
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Mentz114 said:Probability (nor amplitude) is not stuff.
But not all QM interpretations interpret the wave function as a probability amplitude. The MWI, for example, interprets it as describing an actual reality in which every branch exists; there are no probabilities. (Which is why one of the main issues with the MWI is how to make sense of the fact that, when we are actually using the wave function to do practical calculations, we do interpret it as giving probability amplitudes, and that practical method works.)