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I have a question regarding the paper by John Bell (www.drchinese.com/David/Bell_Compact.pdf [Broken]) in which he shows that a certain hidden variable approach cannot reproduce the expectation values predicted by QM for a pair of particles in the singlet state.

After eqn 15 on page 4, I don't understand the logic. Why can't ##P(b,c)## be stationary at the point ##b=c##? Seems like ##P## could have a minimum at ##b=c## and hence be a stationary point. How does ##P(b,c)## being the order of ##|b-c|## around ##b=c## prevent that? I guess I'm missing something big here.

After eqn 15 on page 4, I don't understand the logic. Why can't ##P(b,c)## be stationary at the point ##b=c##? Seems like ##P## could have a minimum at ##b=c## and hence be a stationary point. How does ##P(b,c)## being the order of ##|b-c|## around ##b=c## prevent that? I guess I'm missing something big here.

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