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On a toroidalization for klt singularities

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arxiv 2106.15019 v3 pith:VF7Y6OJV submitted 2021-06-28 math.AG

classification math.AG
keywords provesingularitiesactionsfinitefundamentalgroupsingularitytoroidalization
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In this article, we prove a toroidalization principle for finite actions on klt singularities. As an application, we prove that the Jordan property for the regional fundamental group of klt singularities can be realized geometrically: by extracting a toric singularity over the klt germ. In the course of the proof, we will prove statements about finite actions on dual complexes and almost fixed points in the fibers of equivariant Fano type morphisms. Furthermore, we will prove that the rank of a fundamental group of the klt singularity is bounded above by its regularity.

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  1. Complexity one varieties are cluster type

    math.AG 2025-04 conditional novelty 7.0 of 10

    A log Calabi-Yau pair of index one and complexity at most one is a cluster type variety, and varieties of absolute complexity one admit a finite cluster type cover of degree at most two.

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