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Splicing positroid varieties

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abstract

We construct an explicit isomorphism between an open subset in the open positroid variety $\Pi_{k,n}^{\circ}$ in the Grassmannian $\mathrm{Gr}(k,n)$ and the product of two open positroid varieties $\Pi_{k,n-a+1}^{\circ}\times \Pi_{k,a+k-1}^{\circ}$. In the respective cluster structures, this isomorphism is given by freezing a certain subset of cluster variables and applying a cluster quasi-equivalence.

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math.AG 1

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2025 1

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CONDITIONAL 1

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Global positroid varieties

math.AG · 2025-09-09 · conditional · novelty 7.0

Global positroid varieties are flat families whose general fiber is a classical positroid variety and whose special fiber is a union of affine Richardson varieties.

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  • Global positroid varieties math.AG · 2025-09-09 · conditional · none · ref 2022 · internal anchor

    Global positroid varieties are flat families whose general fiber is a classical positroid variety and whose special fiber is a union of affine Richardson varieties.