Marczyk, Michal and Wronski, Leszek
(2011)
Completion of the Causal Completability Problem.
[Preprint]
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Abstract
We give a few results concerning the notions of causal completability and causal closedness of classical probability spaces (HoferSzabó, Rédei & Szabó [1999], Gyenis & Rédei [2004]). Answering a question from HoferSzabó et al. [1999], we prove that any classical probability space has a causally closed extension. We also employ the notion of causal uptonclosedness (Wroński & Marczyk [2010a]) to show that any finite classical probability space with rational probabilities on the atoms of the event algebra can be extended to a finite space which is causally upto3closed. Lastly, we prove that any classical probability space can be extended to a space in which all correlations between events which are logically independent modulo measure zero event have a countably infinite common cause system (for the definition of the latter notion, see HoferSzabó & Rédei [2004]). Collectively, these results show that it is surprisingly easy to find Reichenbachstyle explanations for correlations, underlining doubts as to whether this approach can yield a philosophically relevant account of causality.
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