Full pattern support conjecture for skew Brownian permutons

Let μρ,q\bm \mu_{\rho,q} be a skew Brownian permuton with parameters (ρ,q)(1,1)×(0,1)(\rho,q)\in(-1,1)\times(0,1). For kZ>0k\in\mathbb{Z}_{>0}, let π\pi be a permutation pattern of size kk, and let Permk(μρ,q)\operatorname{Perm}_k(\bm \mu_{\rho,q}) be the permutation induced by kk independent points sampled from μρ,q\bm \mu_{\rho,q}. Full pattern support conjecture. For all (ρ,q)(1,1)×(0,1)(\rho,q)\in(-1,1)\times(0,1), all kZ>0k\in\mathbb{Z}_{>0}, and every pattern π\pi of size kk,

P(Permk(μρ,q)=π)>0.\mathbb{P}(\operatorname{Perm}_k(\bm \mu_{\rho,q})=\pi)>0.

This asserts that every finite permutation pattern has positive probability for interior parameter values. The source presents it as an intuition-based statement; its resolution is not specified in the supplied text.

Sources & referencesView supporting material

Primary source

Jacopo Borga, “The skew Brownian permuton: a new universality class for random constrained permutations”, arXiv:2112.00156 (2023).

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