Joy Christian wrote: ↑Fri Nov 05, 2021 4:00 pm
Justo wrote: ↑Fri Nov 05, 2021 3:54 pm
Joy Christian wrote: ↑Fri Nov 05, 2021 3:44 pm
No. Eq. (1) is Bell's local model. See Section 3 of his 1964 paper.
I do not agree. See the title, it is only an illustration, an example of a local realistic model with
. I think that Gill wrote a paper exploring other possibilities where the "triangle line" is replaced by a more general zig-zag polygonal line.
Eq. (1) in my paper is known --- indeed well known --- as "Bell's local model." My paper is about probabilities in that specific "Bell's local model."
I agree. Bell has a specific model which he introduces as an example, and he also has a family of models. The specific model is well known as Bell's local model (or something very similar). But obviously, confusion is possible, since we also have Bell's general formulation of local hidden variables.
I also do not know if the probabilities which Joy refers to have been calculated before. However, if one knows the correlation and the two marginal distributions of the outcomes then you know all four probabilities of the outcome pairs ++, +-, -+, --. This is true, because of the following considerations.
All four probabilities add to one.
The probabilities of ++ and of +- add to 0.5.
The probabilities of ++ and of -+ add to 0.5.
The correlation is the probability of equal outcomes minus the probability of unequal outcomes.
That gives us four linear relations with four unknowns (if the correlation is already known). Not difficult to solve.
Denote the correlation by "r"
(P(++) + P(--)) - (P(+-) + P(--)) = r
But
(P(++) + P(--)) + (P(+-) + P(--)) = 1
So
P(++) + P(--) = (1 + r) / 2
By symmetry,
P(++) = P(--)
Therefore
P(++) = P(--) = (1 + r) / 4
P(+-) = P(-+) = (1 - r) / 4
Hence P(++) +