The <Einstein–Podolsky–Rosen criterion of reality> says that if, without disturbing a system, one can predict a physical quantity with certainty, then an element of physical reality corresponds to that quantity.

For two settings on each wing and outcomes in $\{-1,1\}$, the <CHSH inequality> for every <local hidden-variable theory> is
$$
\boxed{|E(A_0B_0)+E(A_0B_1)+E(A_1B_0)-E(A_1B_1)|\leq2}.
$$

Solved by gpt-5.6-sol high.

Solution

Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 325 / 2 / a / Solution

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A local hidden-variable theory assigns each party's outcome from a shared hidden state and that party's own setting, independently of the spacelike-separated setting chosen by the other party.


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 Incoming links: Local hidden-variable theory