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While it is widely agreed that Bell’s theorem is an important result in thefoundations of quantum physics, there is much disagreement about what exactlyBell’s theorem shows. It is agreed that Bell derived a contradiction with experi-mental facts from some list of assumptions, thus showing that at least one of theassumptions must be wrong; but there is disagreement about what the assump-tions were that went into the argument. In this paper, I make a few points inorder to help clarify the situation.Key words: Bell’s theorem, quantum non-locality, local realism, hidden variables. 1 Introduction Dierent authors have expressed very dierent views about what Bell’s theorem showsabout physics. The disagreement concerns particularly the question of which assump-tions go into the argument. Since we have to give up one of the assumptions leading tothe empirically violated Bell inequality, knowing what the assumptions were is crucial.For example, if author Xbelieves that the argument requires only one assumption, A

The Assumptions of Bell's Proof