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Thanks, Ruth, your second paragraph is precisely what I tried to suggest and what hopefully will help us not to misunderstand each other. Can you recommend a paper (or part thereof) where the transactional model is generally defined (if possible without relying on pedagogical examples a la Wheeler-Feynman, that is, without using classical particles and fields – as you seem to indicate)? I am not yet sure that the model can be dynamically consistent – but that should not be discussed at this point.
I have not sufficiently understood Mark Stuckey’s propal in order to criticize or suggest an improvement of his own classification (so I hope his may help us to better understand him). For all solutions belonging to 3b, I would, in particular, like to understand explicitly how they explain the general success of the superposition principle (including wave mechanics).
Another model for which I woud like to know precisely where to put it in my taxonomy according to its proponents is ´´consistent histories´´.
If you like, you may subdivide 1a (collapse theories) as
a1) Pearle, GRW
a2) gravitationally induced (Penrose, Diosi)
a3) mind induced (Wigner)
You may have noticed that I did not explicitly list decoherence, since imo it belongs to 1b if regarded as a solution of the measurement problem (although it has also to be taken into account as a partial but unavoidable and important step in other psi-ontic proposals).
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