The g-vector formula from a single F-polynomial

Fix B0,t0,,tB^0,t_0,\ell,t such that F;tB0;t01F_{\ell;t}^{B^0;t_0}\neq1, and write g;tB0;t0=(g1,,gn)\mathbf{g}_{\ell;t}^{B^0;t_0}=(g_1,\dots,g_n). Let Trop(u1,,un)\operatorname{Trop}(u_1,\dots,u_n) denote the tropical semifield specialization. Single-F-polynomial g-vector conjecture.

u1g1ungn=F;tB0;t0Trop(u1,,un)(u11,,un1)F;tB0;t0Trop(u1,,un)(iuibi10,,iuibin0).u_1^{g_1}\cdots u_n^{g_n}=\frac{F_{\ell;t}^{B^0;t_0}|_{\operatorname{Trop}(u_1,\dots,u_n)}(u_1^{-1},\dots,u_n^{-1})}{F_{\ell;t}^{B^0;t_0}|_{\operatorname{Trop}(u_1,\dots,u_n)}\left(\prod_i u_i^{b^0_{i1}},\dots,\prod_i u_i^{b^0_{in}}\right)}.

The formula would recover the g\mathbf{g}-vector from one FF-polynomial alone. It is proved on the bipartite belt and remains open in general.

Sources & referencesView supporting material

Primary source

Sergey Fomin and Andrei Zelevinsky, “Cluster algebras IV: Coefficients”, arXiv:math/0602259 (2006).

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