The global-branch positivity conjecture for higher-intersection promotions

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Let (G,D)(G,\mathbf{D}) be a tangle admitting a brushing, with dim⁡ΠG=km\dim\Pi_G=km and positive intersection number IN⁡m(G)>0\operatorname{IN}_m(G)>0. Let F(G,D)^F_{\widehat{(G,\mathbf{D})}} be the associated space and let Gr⁡m,n>0\operatorname{Gr}^{>0}_{m,n} denote the totally positive Grassmannian. Global-branch positivity conjecture. One can choose a brushing and signs for which the higher-intersection positivity conjecture holds, and

F(G,D)^∩(Gr⁡m,n>0×Gr⁡m,D(1)>0×⋯×Gr⁡m,D(ℓ)>0)F_{\widehat{(G,\mathbf{D})}}\cap\left(\operatorname{Gr}^{>0}_{m,n}\times\operatorname{Gr}^{>0}_{m,D^{(1)}}\times\cdots\times\operatorname{Gr}^{>0}_{m,D^{(\ell)}}\right)

is the disjoint union of a fixed number of graphs of functions from Gr⁡m,n>0\operatorname{Gr}^{>0}_{m,n} to ∏D∈DGr⁡m,D>0\prod_{D\in\mathbf{D}}\operatorname{Gr}^{>0}_{m,D}. This remains open beyond the illustrated cases.

References

Primary source

Chaim Even-Zohar, Matteo Parisi, Melissa Sherman-Bennett, Ran Tessler and Lauren Williams, “Plabic Tangles and Cluster Promotion Maps”, arXiv:2508.02891 (2026).

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