The dominant solvable plabic tangle quasi-cluster conjecture

Let (G,D)(G,\mathbf{D}) be a dominant solvable plabic tangle, where GG has nn outer boundary vertices and inner disks D(1),,D()D^{(1)},\dots,D^{(\ell)}, and let mm-VRCs denote the associated mm-vector-relation configurations. Dominant solvable tangle conjecture. There is a normalization of the vectors in the mm-VRCs such that geometric promotion

ψ:Grm,nGrm,D(1)××Grm,D()\psi:\operatorname{Gr}_{m,n}\dashrightarrow\operatorname{Gr}_{m,D^{(1)}}\times\cdots\times\operatorname{Gr}_{m,D^{(\ell)}}

sends totally positive elements to totally positive elements, and algebraic promotion

Ψ=ψ:C(Grm,D(1))C(Grm,D())C(Grm,n)\Psi=\psi^*:\mathbb{C}(\operatorname{Gr}_{m,D^{(1)}})\otimes\cdots\otimes\mathbb{C}(\operatorname{Gr}_{m,D^{(\ell)}})\to\mathbb{C}(\operatorname{Gr}_{m,n})

is a quasi-cluster homomorphism after freezing some variables on the right-hand side. The paper proves the assertion for several classes, but the general statement remains open.

Sources & referencesView supporting material

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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