The quantum T-system conjecture for quantum minors

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Let i=(i1,…,il)\mathbf{i}=(i_1,\ldots,i_l) be a reduced expression of a braid group element b∈Br⁡+b\in\operatorname{Br}^+, and let [a,c]⊂[1,l][a,c]\subset[1,l] be an ii-box, meaning that ia=ici_a=i_c. For each such box, let D^i[a,c]\widehat{D}_{\mathbf{i}}[a,c] denote the corresponding quantum minor, defined as the global basis element associated with the sequence supported on positions in [a,c][a,c] whose letter is iai_a. For an index rr, write r+r^+ and r−r^- for the relevant neighboring occurrences of the same simple index, and write a+(j)a^+(j) and c−(j)c^-(j) for the corresponding neighboring positions for jj.

Quantum T-system conjecture. For any ii-box [a,c][a,c], there exist constants AA and BB such that

D^i[a+,c]D^i[a,c−]=qAD^i[a,c]D^i[a+,c−]+qB∏d(ia,j)=1D^i[a+(j),c−(j)].\widehat{D}_{\mathbf{i}}[a^+,c]\widehat{D}_{\mathbf{i}}[a,c^-]=q^A\widehat{D}_{\mathbf{i}}[a,c]\widehat{D}_{\mathbf{i}}[a^+,c^-]+q^B\prod_{d(i_a,j)=1}\widehat{D}_{\mathbf{i}}[a^+(j),c^-(j)].

The relation is a quantum-minor analogue of a T-system. It is known to hold in Dynkin cases by Kashiwara, Kim, Oh, and Park, but the supplied text does not establish it in the generality stated.

References

Primary source

Yingjin Bi, “On cluster structures of bosonic extensions”, arXiv:2506.00882 (2026).

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