Sankhya: The Indian Journal of Statistics
1999, Volume 61, Series A, Pt. 2, 282-285
CHARACTERISATION OF CORRELATION MATRICES OF SPIN VARIABLES
J.C. GUPTA, Indian Statistical Institute, Calcutta
SUMMARY. Necessary and sufficient conditions are given for a correlation matrix of order n >= 2 to be the correlation matrix of spin variables in the classical sense. It is shown that Bell's inequalities (1964) are not sufficient for matrices of order n >= 5.
AMS (1991) subject classification. 62H20.
Key words and phrases. Bell's inequality, spin variables.
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