Conjecture on disjoint positive root sets in folded cluster structures

Let DD2mD^{\perp}\simeq\mathbf{D}_{2m} with m2m\geq 2, let 1lm11\leq l\leq m-1, and let P\mathcal{P} be the power set of {1,,l}\{1,\cdots,l\}. For each ϖ={i1,,ih}P\varpi=\{i_{1},\cdots,i_{h}\}\in\mathcal{P}, let sϖ{\bf s}_{\varpi} be the seed obtained by performing the reflections rαi1rαihr_{\alpha_{i_{1}}}\circ\cdots\circ r_{\alpha_{i_{h}}}, and let Δsϖ,Π+\overline{\Delta}_{{\bf s}_{\varpi},\Pi}^{+} denote the associated positive folded root set. Disjointness conjecture. For any two distinct elements ϖ,ϖ\varpi,\varpi^{'} in P\mathcal{P}, Δsϖ,Π+\overline{\Delta}_{{\bf s}_{\varpi},\Pi}^{+} and Δsϖ,Π+\overline{\Delta}_{{\bf s}_{\varpi^{'}},\Pi}^{+} have trivial intersection. This predicts that the positive folded root sets arising from the different reflection sequences are pairwise disjoint, providing a potentially interesting application of the folding procedure in positive non-acyclic cases.

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Primary source

Yan Zhou, “Weyl groups and cluster structures of families of log Calabi-Yau surfaces”, arXiv:1910.05762 (2021).

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