The extension conjecture for the Winder existential ordering

Let [n]={1,,n}[n]=\{1,\ldots,n\} and let Δ2[n]\Delta\subseteq2^{[n]} be a strongly acyclic simplicial complex. Define the Winder desirability relation W\leq_W on 2[n]2^{[n]} by AWBA\leq_W B if and only if, for every Z[n]((AB)(BA))Z\subseteq[n]\setminus((A\setminus B)\cup(B\setminus A)),

(AB)ZΔ(BA)ZΔ.(A\setminus B)\cup Z\notin\Delta\Rightarrow(B\setminus A)\cup Z\notin\Delta.

Define the Winder existential ordering W\prec_W by AWBA\prec_W B if and only if it is not the case that BWAB\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.

Sources & referencesView supporting material

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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