Stephen Tashi

Science Advisor

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I don't see that this has anything to do with a limitation of probability theory. If indeed, the slit through which the particle passes is measured then you'd get classical results. The problem is with the physical model. The particle does not pass though only one slit or the other unless it is observed to do so. The fact that a given probability model does not agree with experimental data doesn't demonstrate a limitation of probabilityImagine we have a particle at a source, ##S##. It then may pass through either of two intermediate points - perhaps two slits in the double-slit experiment - let's call these ##P1## and ##P2##. It then may or may not end up at point ##X## on a screen.

We can calculate the following:

##p(P1|S), p(P2|S)## - the probability that a particle from the source passes through point

##P1, P2## respectively.

*theory*. It demonstrates a limitation of the concepts used in the model.