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A thought experiment is considered on observation of instantaneous collapseof an extended wave packet. According to relativity of simultaneity, such acollapse being instantaneous in some reference frame must be a lasting processin other frames. But according to quantum mechanics, collapse is instantaneousin any frame. Mathematical structure of quantum mechanics eliminates anycontradictions between these two apparently conflicting statements. Here theinvariance of quantum-mechanical collapse is shown to follow directly from theBorn postulate, without any use of mathematical properties of quantumoperators. The consistency of quantum mechanics with Relativity is also shownfor instant disentanglement of a composite system.

How the instant collapse of a spatially-extended quantum state is consistent with relativity of simultaneity