The Two Bells Theorems of John Bell


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Many of the heated arguments about the meaning of Bells theorem arise because this phrase can refer to two different theorems that John Bell proved, the first in 1964 and the second in 1976. His 1964 theorem is the incompatibility of quantum phenomena with the dual assumptions of locality and determinism. His 1976 theorem is the incompatibility of quantum phenomena with the unitary property of local causality. This is contrary to Bells own later assertions, that his 1964 theorem began with that single, and indivisible, assumption of local causality (even if not by that name). While there are other forms of Bells theorems --- which I present to explain the relation between Jarrett-completeness, fragile locality, and EPR-completeness --- I maintain that Bells t

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