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On the coefficients in the Jones-Wenzl idempotent

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arxiv 2406.06333 v1 pith:TSNB4F2Z submitted 2024-06-10 math.RT

classification math.RT
keywords coefficientsidempotentjones-wenzlalgebracertainexpressedantisymmetriserbasis
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By studying a categorification of the antisymmetriser quasi-idempotent in the Hecke algebra, we derive a closed formula for the Jones-Wenzl idempotent in the Temperley-Lieb algebra. In particular, we show that when the idempotent is expressed in terms of the monomial basis, the coefficients are the graded ranks of certain indecomposable Soergel modules. Equivalently, the coefficients can be expressed as a ratio of certain Kazhdan-Lusztig polynomials. Similar results are obtained for generalised Jones-Wenzl idempotents in other types.

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  1. Jones--Wenzl projections of type $D$ and Dyck tilings

    math.CO 2024-12 conditional novelty 6.0 of 10

    Coefficients of the type D Jones-Wenzl projection are expressed as generating functions over Dyck tilings decorated with bi-colored vertical Hermite histories, for both even and odd dot cases.

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