Fraser's quasi-cluster transformation conjecture for Richardson twists

Let vwv\leq w and let τv,w:R˚v,wR˚v,w\tau_{v,w}:\mathring{\mathcal{R}}_{v,w}\to\mathring{\mathcal{R}}_{v,w} be the right twist map. A quasi-cluster transformation means a sequence of cluster mutations followed by rescaling by Laurent monomials in frozen variables. Let A(Σv,wIng)\mathcal{A}(\Sigma_{v,\mathbf{w}}^{\operatorname{Ing}}) and A(Σv,wLec)\mathcal{A}(\Sigma_{v,\mathbf{w}}^{\operatorname{Lec}}) denote the cluster algebras associated with Ingermanson's and Leclerc's seeds, respectively. Richardson twist conjecture. The twist map τv,w\tau_{v,w} is a quasi-cluster transformation. Consequently, any cluster of A(Σv,wIng)\mathcal{A}(\Sigma_{v,\mathbf{w}}^{\operatorname{Ing}}) is related to any cluster of A(Σv,wLec)\mathcal{A}(\Sigma_{v,\mathbf{w}}^{\operatorname{Lec}}) by a sequence of mutations and rescaling by Laurent monomials in frozen variables. The source notes that this extends the analogous conjecture for positroid varieties; its truth in the Richardson setting is not established in the supplied text.

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Primary source

Khrystyna Serhiyenko and Melissa Sherman-Bennett, “Leclerc's conjecture on a cluster structure for type A Richardson varieties”, arXiv:2210.13302 (2022).

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