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Graded Character Formula for Fusion Products of Irreducible Modules and Littlewood-Richardson Coefficients in Type $A_2$

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arxiv 2303.03337 v2 pith:LGXDJRU5 submitted 2023-03-06 math.RT math.RA

classification math.RTmath.RA
keywords modulesfusioncharactergradedcoefficientsexactformulairreducible
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abstract

We investigate a specific class of CV modules for $\mathfrak{sl}_3$ and establish an exact sequence for these modules. Utilizing dimension arguments, we demonstrate that this module is isomorphic to the fusion product of irreducible modules, thereby offering a new proof of the conjecture regarding the independence of fusion products from parameters. By analyzing the filtration of the kernel within the exact sequence, we derive the graded character formula for fusion product modules. Moreover, we leverage the graded character to deduce the algebraic characterization of the Littlewood-Richardson (LR) coefficients and present an alternative proof of the saturation theorem in type $A_2$.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Graded representations of current Lie superalgebras $\mathfrak{sl}(1|2)[t]$

    math.RT 2025-06 conditional novelty 6.0 of 10

    New super POPs parametrization, graded character formula, and short exact sequence of Chari-Venkatesh modules for sl(1|2)[t], with a new proof of the fusion-product isomorphism.

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