A Short Note on Discrete Representability of Independence Models.
Petr Šimeček · 2006
The paper discusses the problem to characterize collections of conditional independence triples (independence model) that are representable by a discrete distribution. The known results are summarized and the number of representable models over four elements set, often mistakenly claimed to be 18300, is corrected. In the second part, the bounds for the number of positively representable models over four elements set are derived. 1