minkwe wrote:Schmelzer wrote:Bell names it differently (and I think more adequate) "predetermined". Whatever,
...
I have misunderstood your understanding of CFD, but in this case I would not care about your understanding of CFD anymore, because the second part of Bell's proof needs only (1) and (2), and, in case this does not contain your CFD, your CFD is not necessary for the proof and your irrelevant hobby.
Sorry, this is incoherent. When Bell says on page 406:
Bell wrote:"it follows that 'c' is another unit vector",
P(a,b) - P(a,c) = ...
What do you think he is doing? There are two particles and three angles "a", "b", "c". Where do you think the "c" result comes from, if it is not counterfactual?
It is, and I do not claim that Bell is not using CFD. My claim was that he uses a more adequate name "predetermined". And, if your notion of CFD (which seems to differ from the mainstream way, which does not claim that CFD exists in QM, but admits a definiteness only after a preparational measurement.) differs from the notion used in the word "predetermined" and the formulas (1), (2), I do not have to care about this strange notion.
minkwe wrote:You claimed my understanding of CFD was not mainstream, yet you can't even bring yourself to state what my understanding of CFD is, and how it differs from the mainstream one. In fact, you haven't even presented a mainstream definition of CFD. You rambled about predetermination, which is a different concept from CFD.
So, we see that your concept of CFD differs from what Bell has used ("predetermined"). I see differences too, these differences being in favour of using "predetermined", but essentially, if one uses the mainstream understanding of CFD, these are minor, irrelevant differences.
minkwe wrote:Now you want to change the topic from CFD to predetermination, and you are challenging me to find loopholes in the "derivation" of predetermination? More confusion.
I simply want to stay close to the text, and this text uses predetermination and derives it using the EPR argument. So, no, I don't want to change the topic, you have changed it by introducing a notion not mentioned in Bell's paper, and introducing it in a strange, confusing version, with strange implications like suggestions that we have CFD in QM. It is your point that there is somthing wrong with Bell's paper, not my. So you have to challenge Bell's paper, which mentions predetermination, but not your personal version of CFD which makes QM a theory with CFD.
minkwe wrote:Good! You answer
"True", when you don't yet know along what axis Bob measured. Now I reveal that indeed Bob had measured along axis "b" not "a". In other words, the only thing that has changed is you now know the axis along which Bob measured and it is not "a". Would you change your answer from
"True"? If not, then you have agreed that an experiment which was not performed (ie, Bob measuring along "a") has a single definite result -1.
http://arxiv.org/pdf/1007.4281.pdf: [CFD] is the assumption that a measurement that was not performed had a single definite result.
Get it?
Yes. This is the exceptional case, where the measurement of Alice creates the state of Bob as an eigenstate. There is a very small class states and corresponding measurements where QM predefines the result of a measurement. The most important example is simply a repetition of the same measurement. There are other cases, the simplest one being some nontrivial unitary evolution, so that after this the state becomes a different one, and the measurement which measures it too. So, in these exceptional cases, QM tells us that there is a unique outcome of this experiment.
So, we have CFD in QM in some exceptional, artificially constructed cases. In general, we have no CFD in QM.
minkwe wrote:You still haven't specified exactly what this difference is between "my CFD" and mainstream CFD. I've asked you many times. You don't even know that there is a difference yet you continue to make claims about differences.
I see continuing suggestions that we have CFD in QM, which are nonsense, and supported only by some trivial exceptional cases, which have nothing to do with the general case. In the particular case of the Bell experiment, out of the full S^2 of possible directions we have 1 direction (ok, 2, the opposite too) where QM gives us CFD. In above cases, there is not much conterfactual, given that there have been definite experiments with definite outcomes.
minkwe wrote:If Bell forgets to consider that particles may not all be detected, then anytime a particle is not detected, the experiment is "invalid".
As if it would matter how you name it. Name it "invisible pink unicorn" if you like.
Moreover, it does not matter at all if Bell has forgotten about this possibility or not. The detection loophole is a loophole of particular experimental tests of BI, and the aim of the paper was not to consider particular tests.
minkwe wrote:If Bell forgets to consider hidden instrument parameters in his derivation, then instruments are forbidden from having hidden parameters.
They are not forbidden, the space of possible values of

is arbitrary, thus, can contain instrument hidden parameters too. What matters is that there is predetermination, derived from the EPR criterion, which does not allow them to depend on a and b.
minkwe wrote:If Bell forgets to consider time-delays in particle detections, then when time delays are present, the experiment is "invalid".

Bell's theorem is not about experimental realizations, thus, he has not "forgotten" such things, they are simply not part of what is considered in the paper.
minkwe wrote:Yet when it is pointed out to you that Bell required counterfactual results in the derivation. You insist in thinking experiments which do not contain any counterfactual results are "nice" and "good" and "valid". This is a religion not a science, and you are a bishop in the church of Bell.
Name them as you like, I couldn't care less. Of course, once Bell has derived that the experimental outcomes have to be predefined, he can use CFD after this in the derivation.
minkwe wrote:Of course, about the outcomes with a 0 value, which means "A 0 value means the particle was not detected".
The expectation values are calculated in exactly the same way in all CHSH-test experiments, and in epr-simple, using the above equation. You claim that some experiments are rejected because they have zero outcome. The outcomes containing zero terms are N{+0}, N{0+}, N{-0}, N{0-}, which are not present in the above expression. What difference does it make to the expectation value if I reject the results with zero outcomes, if none of them are relevant for the calculation above???
It is the difference that if there are such detection failures, we have the detector efficiency loophole open, thus, the experiment does not allow to rule out local realism. And the simulation does not present a counterexample to Bell's theorem. In above cases, the experiment as well as the simulation do not reach their aim.
minkwe wrote:The sum is over those a, b, which have values
\neq 0)
,
\neq 0)
.
If you sum over those which have, additionally, also
\neq 0)
,
\neq 0)
resp. for B, you get a sum over a different subset of experiments, and even if the experimental outcomes themself are the same for all choicse in above sums, the sums will be different.
This makes no sense. None of the expectation values contain N{+0}, N{0+}, N{-0}, N{0-} terms, so it boggles my mind why you would think the zero outcomes some how magically change the calculated expectation values.
Why should I care what boggles your mind? The sum is over a different set of outcomes, one symmetric to permutations between a,b,c,d, the other one asymmetric. We need symmtry in the proof of the theorem, and it is easy to construct counterexamples with asymmetric sets.
minkwe wrote:Expectation values are always calculated from a list of pairs of outcomes. The point of the demonstration was to show what happens when you do not use counterfactual outcomes, and what happens when you use counterfactual outcomes. But as I suspected, detractors will miss the point and go down a rabbit hole.
It happened exactly what I would have predicted based on Bell's theorem. So, indeed, I miss the point why you think that this somehow supports your beliefs.