Cubical-distance conjecture for largest minors

Let J([n]k)\mathcal{J}\subset {[n]\choose k} be an arrangement of largest minors, and let W([n]k)W\in {[n]\choose k}. Say that WW is (t,J)(\geq t,\mathcal{J})-largest if, for every arrangement of minors ending at J\mathcal{J}, it is absent from the final t1t-1 arrangements. For a maximal arrangement J\mathcal{J} of largest minors and WJW\notin\mathcal{J}, let cubed(W,J)cube_d(W,\mathcal{J}) denote their cubical distance. Cubical-distance conjecture. If

cubed(W,J)=t,cube_d(W,\mathcal{J})=t,

then WW is (t+1,J)(\geq t+1,\mathcal{J})-largest minor. This conjecture predicts that cubical distance from a maximal arrangement controls how far below the largest minors an omitted minor lies. Its resolution is not indicated in the supplied text.

Sources & referencesView supporting material

Primary source

Miriam Farber and Yelena Mandelshtam, “Arrangements Of Minors In The Positive Grassmannian And a Triangulation of The Hypersimplex”, arXiv:1509.02600 (2015).

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