An infinite class of inequalities formulated by Bell (1964) which seemed to be a physically reasonable condition of
locality imposing restrictions on the maximum correlations of the measurements of a pair of spin 1/2 particles formed in
the singlet state and moving freely in opposite directions, as considered in the Einstein-Podolsky-Rosen paradox.
Bell's inequalities can be tested in a laboratory experiment (under certain assumptions) because the statistical
predictions of quantum mechanics are incompatible with any local hidden variables theory apparently satisfying
only the natural assumptions of "locality," as shown by the predictions of Bell's inequality. However, at present
there are no "clean" experiments unambiguously verifying the inequalities.
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Bell, J. S. "On the Einstein-Podolsky-Rosen Paradox." Physics 1, 195-200, 1964.
Elm, D. A. http://www.tiac.net/users/davidelm.
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