The extension conjecture for the Winder existential ordering

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Let [n]={1,…,n}[n]=\{1,\ldots,n\} and let Δ⊆2[n]\Delta\subseteq2^{[n]} be a strongly acyclic simplicial complex. Define the Winder desirability relation ≤W\leq_W on 2[n]2^{[n]} by A≤WBA\leq_W B if and only if, for every Z⊆[n]∖((A∖B)∪(B∖A))Z\subseteq[n]\setminus((A\setminus B)\cup(B\setminus A)),

(A∖B)∪Z∉Δ⇒(B∖A)∪Z∉Δ.(A\setminus B)\cup Z\notin\Delta\Rightarrow(B\setminus A)\cup Z\notin\Delta.

Define the Winder existential ordering ≺W\prec_W by A≺WBA\prec_W B if and only if it is not the case that B≤WAB\leq_W A. An extension of ≺W\prec_W is a total ordering on 2[n]2^{[n]} containing every relation in ≺W\prec_W; a qualitative probability order is a total order satisfying de Finetti's axiom. Winder extension conjecture. If Δ\Delta is strongly acyclic then there exists an extension of ≺W\prec_W to a qualitative probability order. This is presented as a slightly stronger version of the preceding characterization conjecture. The preceding lemmas provide support by showing that ≺W\prec_W respects membership in Δ\Delta and satisfies the required cancellation property, but the existence of the extension remains open in the supplied text.

References

Primary source

Paul H. Edelman, Tatyana Gvozdeva and Arkadii Slinko, “Simplicial Complexes Obtained from Qualitative Probability Orders”, arXiv:1108.3700 (2011).

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