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On exchange matrices from string diagrams

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arxiv 2203.07822 v2 pith:LHIH6TLS submitted 2022-03-15 math.RT math.CO

classification math.RTmath.CO
keywords matricesskew-symmetrizablecellsdiagramsmanystringtheorycite
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abstract

Inspired by Fock-Goncharov's amalgamation procedure \cite{Fock-Goncharov-2006}, Shen-Weng introduced string diagrams in \cite{Shen-Weng-2021}, which are very useful to describe many interesting skew-symmetrizable matrices closely related with Lie theory. In this paper, we prove that the skew-symmetrizable matrices from string diagrams are in the smallest class $\mathcal P^\prime$ of skew-symmetrizable matrices containing the $1\times 1$ zero matrix and closed under mutations and source-sink extensions. This result applies to the exchange matrices of cluster algebras from double Bruhat cells, unipotent cells, double Bott-Samelson cells and so on. Our main result can be used to explain why many skew-symmetrizable matrices from Lie theory have reddening sequences. It can be also used to prove some interesting results regarding non-degenerate potentials on many quivers from Lie theory.

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  1. Cluster Algebras for Bosonic Plethysm

    math.RT 2026-08 conditional novelty 7.0 of 10

    For tuples of symmetric matrices, an explicit folded cluster seed gives the invariant ring and expresses symmetric-square plethysm coefficients as alternating sums of cone lattice point counts.

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