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In relativity, the wave function in different frames is not unitarily related, because the wave function collapses at different times. For example, in a Bell experiment, in a frame in which Alice and Bob measure simultaneously, there is no collapse. But in a frame in which Alice measures before Bob, Alice collapses the wave function. Here it seems that there are multiple wave functions for the same situation, but PBR says that the true state (including hidden variables) implies a unique wave function. Does PBR apply, because the true state is different in each frame (a state requires a choice of simultaneity), or does PBR not apply?