Mutation compatibility conjecture for g-vectors

Let Tn\text{T}_n be the nn-regular tree indexing seeds, let t0t_0 and t1t_1 be adjacent vertices in direction kk, and let B0B_0 and B1B_1 be exchange matrices with B1=μk(B0)B_1=\mu_k(B_0). For a cluster variable indexed by ii at tt, write its g\boldsymbol{g}-vectors relative to these initial seeds as gi;tB0;t0\boldsymbol{g}_{i;t}^{B_0;t_0} and gi;tB1;t1\boldsymbol{g}_{i;t}^{B_1;t_1}. Mutation compatibility conjecture. For every tt and ii,

gi;tB1;t1=ηkB0T(gi;tB0;t0),\boldsymbol{g}_{i;t}^{B_1;t_1}=\eta_k^{B_0^T}(\boldsymbol{g}_{i;t}^{B_0;t_0}),

where B0TB_0^T is the transpose of B0B_0. This is presented as an equivalent reformulation of the weak version of the cited g\boldsymbol{g}-vector mutation conjecture; it is known when the relevant exchange matrices are skew-symmetric.

Sources & referencesView supporting material

Primary source

Nathan Reading, “Universal geometric cluster algebras”, arXiv:1209.3987 (2026).

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