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Minimal reduction type and the Kazhdan-Lusztig map

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arxiv 2010.13642 v3 pith:I52XAV4Z submitted 2020-10-26 math.RT math.AG

classification math.RTmath.AG
keywords affinekazhdan-lusztigminimalreductionspringertypeclassesclassical
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We introduce the notion of minimal reduction type of an affine Springer fiber, and use it to define a map from the set of conjugacy classes in the Weyl group to the set of nilpotent orbits. We show that this map is the same as the one defined by Lusztig, and that the Kazhdan-Lusztig map is a section of our map. This settles several conjectures in the literature. For classical groups, we prove more refined results by introducing and studying the "skeleta" of affine Springer fibers.

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  1. Cyclotomic level maps and associated varieties of simple affine vertex algebras

    math.RT 2025-07 conditional novelty 7.0 of 10

    A new map predicts the associated variety of every simple affine vertex algebra at integer levels above criticality as a single sheet, with compatibility theorems connecting it to reduction types and affine cells.

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