“The gist of Bell's theorem is this: no local model of reality can explain the results of a particular experiment.”

—  Nick Herbert

Source: Quantum Reality - Beyond The New Physics, Chapter 11, The Einstein-Podolsky-Rosen Paradox, p. 199 (See also: John Stewart Bell)

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Nick Herbert 23
American physicist 1936

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“When the Löwenheim-Skolem theorem is applied to particular formal systems, we obtain as special cases: Every group, field, ordered field, etc., has a countable subsystem of the same type. A more spectacular result follows from applying the theorem to set theory (a system which we shall later formalize): There is a countable collection of sets, such that if restrict the membership relation to these sets alone, they form a model for set theory (more precisely all the true statements of set theory are true in this model). In particular, within this model which we may denote by M, there must be an uncountable set. This paradox, that a countable model can contain an uncountable set, is explained by noting that to say a set is uncountable merely asserts the nonexistence of a one-one mapping of the set with the set of integers. The "uncountable" set in M set actually has only countably many members in M, but there is no one-one correspondence \underline {within} M of this set with the set of integers.”

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