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The paper demonstrates a mathematical coincidence between quantum correlation and classical correlation, suggesting structural relevance.
An elementary identity is noted: the quantum correlation E(a,b) = −cos(a−b) predicted for a singlet state is numerically identical to the Pearson correlation coefficient of two classical cosine projections sharing a common hidden angle. The question is posed whether this coincidence has structural significance. The connection to Fine's theorem (1982) on joint distributions and CHSH inequalities is discussed.
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Roberto Pavani (2026) studied this question.
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