Pemantle's CNA+-to-ULC conjecture
Let be the probability measures on subsets of , and let CNA+ denote the strongest negative-association property used in the source. Let ULC mean that the rank sequence is ultra-log-concave. CNA+-to-ULC conjecture. If is CNA+, then it is ULC. The source constructs examples showing that CNA+ need not even imply the weaker SLC property, so this conjecture is refuted.
References
Primary source
Julius Borcea, Petter Brändén and Thomas M. Liggett, “Negative dependence and the geometry of polynomials”, arXiv:0707.2340 (2008).
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