The unrestricted generic-kernel divisor conjecture

Let O(Vk(i),Vl(j))\mathfrak{O}(V^{(i)}_k,V^{(j)}_l) be the divisor of the normalized RR-matrix denominator, and let dimq1extΠ~1\dim_{q^{-1}}\mathop{\mathrm{ext}}^1_{\widetilde{\Pi}} denote the graded extension dimension between the generic kernels Kk(i)K^{(i)}_k and Kl(j)K^{(j)}_l. Unrestricted divisor–extension conjecture. For any i,jIi,j\in I and k,lZ>0k,l\in\mathbb{Z}_{>0},

O(Vk(i),Vl(j))=dimq1extΠ~1(Kk(i),Kl(j)).\mathfrak{O}(V^{(i)}_k,V^{(j)}_l)=\dim_{q^{-1}}\mathop{\mathrm{ext}}^1_{\widetilde{\Pi}}(K^{(i)}_k,K^{(j)}_l).

This generalizes the conditional divisor conjecture by asserting the equality without the inequality kdildjkd_i\ge ld_j or the exceptional condition ()(\clubsuit).

Sources & referencesView supporting material

Primary source

Ryo Fujita and Kota Murakami, “Deformed Cartan matrices and generalized preprojective algebras I: Finite type”, arXiv:2109.07985 (2022).

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