Pemantle's CNA+-to-ULC conjecture

Let Pn\mathfrak{P}_n be the probability measures on subsets of [n][n], 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 μPn\mu\in\mathfrak{P}_n 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.

Sources & referencesView supporting material

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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